Look up operculum or opercular in Wiktionary, the free dictionary. Operculum may refer to: Operculum (brain), the part of the brain covering the insula...

"little lid") (pl.: opercula), may refer to the frontal, temporal, or parietal operculum, which together cover the insula as the opercula of insula. It can...

An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in...

toward the lateral surface of the brain is the operculum (meaning lid). The opercula are formed from parts of the enclosing frontal, temporal, and parietal...

the operculum of a snail, a gastropod mollusc. Not all gastropods have opercula, but in the great majority of those that do have one, the operculum is...

subclasses: Elasmobranchii (sharks, rays, skates and sawfish) which lack opercula, and Holocephali (chimaeras, sometimes called ghost sharks, which are sometimes...

Eucalyptus melliodora, showing flowers and opercula...

Spiromoelleria is a genus of small sea snails with calcareous opercula, marine gastropod mollusks in the family Colloniidae. Species within the genus Spiromoelleria...

Cantrainea inexpectata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Leptothyra nanina is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell reaches a height...

identified by the costal margin bent at the end of the radial cell and opercula truncated obliquely at the extremities. "Species Neotibicen linnei - Linne's...

name the tiny pheasant, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

to a traditional incense ingredient used in many cultures derived from opercula of certain gastropods (slugs and snails). Translated it means: unguis,...

Gripp's dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. WoRMS (2012). Homalopoma...

Leptocollonia thielei is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The colorless shell...

In botany, an operculum (pl.: opercula) or calyptra (from Ancient Greek καλύπτρα (kalúptra) 'veil') is a cap-like structure in some flowering plants, mosses...

Argalista gelleneae is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

They were sedentary, possibly infaunal, organisms; once thought to have opercula (hence the comparison with hyoliths), these structures are now understood...

nares (nostrils) and breathe solely through their epiglottis, via small opercula at the corners of the beak. The anhinga is placed in the darter family...

The insula of the left side, exposed by removing the opercula. From Henry Gray, Warren Harmon Lewis (1918). Anatomy of the Human Body. Fig. 731...

Cantrainea philipiana is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

of a kind of rare sea snail in the family Turbinidae.‌ One place these opercula are found is in the Gomathi River, Dwarka, hence the name. The word Chakra...

Liotipoma dimorpha is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The size of the shell...

Collonia admissa is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell grows to a height...

Leptothyra rubens is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species occurs...

polymorphs. In addition to the tubes, some serpulid species secrete calcareous opercula. Some sabellids and cirratulids can secrete aragonitic tubes. Sabellid...

Engberg dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Rosenberg, G. (2012)...

Eulithidium beaui is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

Japonia is a genus of land snails with opercula, terrestrial gastropods in the subfamily Cyclophorinae of the family Cyclophoridae. The genus was created...

Vestibular cortex The insula of the left side, exposed by removing the opercula. (Image is of left side, but there is some evidence that there may be right-sided...

Constant in 2017. When naming this genus, they referred to the shape of the opercula covering the tymbals (Latin 'cochlear' meaning spoon, Greek: κοχλίας meaning...

Japonia hispida is a species of land snail with opercula, terrestrial gastropods in the family Cyclophoridae. This species is endemic to Japan. Mollusc...

Australian Plant Census: Eucalyptus tereticornis subsp. basaltica A.R.Bean has opercula that are not expanded at the base, juvenile leaves that are dull bluish...

Eulithidium diantha is a species of small sea snail with a calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda. The taxon Sorbeoconcha was named by...

Homalopoma amussitatum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the...

Collonia incerta is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Rosenberg, G. (2012)....

snails with opercula, terrestrial pulmonate gastropod molluscs. This family of pulmonate gastropods, for breathe air, but also have opercula and at least...

driving several meters forward with wide open mouth and far expanded opercula, then closing and cleaning the gill rakers for a few milliseconds. Copepods...

seven plates, with the first two bilobated and might represent its genital opercula and pectines (comb-like sensory appendages) respectively. The third through...

on a school of copepods. They swim with their mouth wide open and their opercula fully expanded.[citation needed] This copepod has its antenna spread (click...

Chimaeras lack spiracles, using gill opercula for buccal pumping instead. Bony fish have similar gill opercula, but the basalmost ray-finned fish, bichirs...

Cirsonella micans is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Skeneidae. The height of the shell...

species which feed on flowers have opercula to help to keep pollen from clogging their nasal passages, while the opercula of the two species of Attagis seedsnipe...

Antrorbis is a genus of minute freshwater snails with gills and opercula, aquatic gastropod molluscs in the family Lithoglyphidae. The generic name is...

Tricolia indica is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

Pictacollonia donghaiensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This species occurs...

Tricolia bicarinata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

Liotipoma splendida is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell grows to...

Japonia shigetai is a species of land snail with opercula, terrestrial gastropods in the family Cyclophoridae. This species is endemic to Japan. Mollusc...

Argalista roseopunctata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Marshall, B. (2013)...

Homalopoma berryi is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Rosenberg, G. (2012)...

Gabrielona roni is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

Anentome is a genus of freshwater snails with opercula, aquatic gastropod mollusks in the subfamily Anentominae of the family Nassariidae, a family, almost...

diagnoses the order thus: Conchs with a flat or concave ventral surface — opercula with large, flat cardinal processes but without clavicles – tightly sigmoidal...

Leptothyra benthicola is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Tricolia gabiniana is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

Homalopoma rubidum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell grows to a...

upside-down on their stalks. The "lower jaws" are modified versions of the opercula that protect the retracted lophophores in autozooids of some species, and...

the coral-red gibbula, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The length of the...

Palaina is a genus of minute land snails with opercula, terrestrial gastropod mollusks or micromollusks in the family Diplommatinidae. Species in the genus...

Collonia is a genus of small sea snails with calcareous opercula, marine gastropod mollusks in the family Colloniidae. Species within the genus Collonia...

Argalista morrisoni is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

The Aciculidae are a family of small land snails that have opercula. Even though Aciculidae are land snails, they live in rather wet conditions, among...

Argalista parvipulcherrima is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Argalista kingensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Homalopoma cunninghami is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the...

terrestrial relatives, the tetrapods. Bony fishes also have a pair of opercula that function to draw water across the gills, which help them breathe without...

Cantrainea jamsteci is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Spiromoelleria quadrae is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell grows...

fins, which gave rise to tetrapods' limbs. They also evolved a pair of opercula (gill covers), which can actively draw water across the gills so they can...

bowing of the costae (the leading edges of its wings) and elongation of the opercula (the covers on its underside of its tympanae, or eardrums), are similar...

Draper's dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This species occurs...

gill chamber), which were originally enclosed by the opercula in life. The metastoma, opercula and genital appendage are shared characters between chasmataspidid...

Cochlostomatinae are a family of small land snails which have opercula and gills. These are terrestrial gastropod mollusks in the superfamily Cyclophoroidea...

Emiliotia immaculata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This species occurs...

casks known as "tuns". While thin, the shells are also strong and lack opercula. They are found in all tropical seas, where they inhabit sandy areas. During...

Argalista lorenzi is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species is...

Orbiscollonia variecostata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the...

Planacollonista rosea is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. (Original description)...

Gabrielona nepeanensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

photosynthesis. For example, pitchers have to be held upright, so that only their opercula directly intercept light. The plant also has to expend extra energy on...

Homalopoma subobsoletum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Rosenberg, G. (2012)...

The insula of the right side, exposed by removing the opercula...

are vigorous and aggressive, and defend their nests by spreading their opercula. Because of this aggressive behavior, pumpkinseeds tend to maintain larger...

Argalista hapei is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species occurs...

or "pheasant snails", is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the subclass Vetigastropoda. The family Phasianellidae...

Leptothyra grossa is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species occurs...

by the mesh around the body. Gilled – held by mesh slipping behind the opercula. Tangled – held by teeth, spines, maxillaries, or other protrusions without...

dark dwarf-turban snail, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the...

Depressipoma laddi is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The shell grows to a...

the coral-red gibbula, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Depressipoma pentegoniostoma is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. (Original description...

The opercula are spoon-shaped not curved laterally and its end is rounded; twice as long as wide and not strongly constricted. These opercula cover...

Homalopoma cordellensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This species occurs...

walking legs while the opisthosoma probably has 6 pairs of plate-like opercula. As of 2020, at least 13 genera and 20 species were considered to be synziphosurines...

female over it. This allows the spermatophore to enter the female's genital opercula, which triggers release of the sperm, thus fertilizing the female. A mating...

the aptychus of ammonites, and to the outer surface of some calcareous opercula of marine gastropods such as some species in the family Trochidae. Sculpture...

Collonista rubricincta is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The shell is minute...

Paraliotipoma is a genus of small sea snails with calcareous opercula, marine gastropod mollusks in the family Colloniidae. Species within the genus Paraliotipoma...

Liotipoma mutabilis is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The length of the shell...

Depressipoma kwajaleina is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The shell grows...

Flower buds and opercula...

the middle of the image a copepod escapes successfully to the left. The opercula (hard bony flaps covering the gills) are spread wide open to compensate...

Liotipoma clausa is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The shell grows to a height...

vaginata (Fabricius, 1787)], but distinct in shape of its metasternal opercula which are drawn back to a point or instead of being rounded; they are moreover...

Cantrainea indica is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Rosenberg, G. (2012)...

Tricolia fordiana is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

1806 translation of a later edition reads: "GYMNOTUS. Head with lateral opercula; 2 tentacula at the upper lip: eyes covered with the common skin: gill-membrane...

overall with males only exhibiting shiny, bluish scales on the gill covers (opercula) and forward part of the abdomen. No brilliant colors such as red, orange...

2012 The shell of green turbans is used as a source of nacre. The large opercula of Turbo marmoratus have been sold as paperweights or door stops. Green...

Spiromoelleria kachemakensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Eulithidium umbilicatum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

Leptothyra kermadecensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

absent. Color is variable but often includes red, orange or pink on the opercula and throat, bright rosy to drab olive flanks and yellow-orange undersides...

pheasant, is an extremely small species of sea snail with a calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

Argalista tapparonei is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. (Original description...

addition, unlike pike, muskies have no scales on the lower half of their opercula.[citation needed] Anglers seek large muskies as trophies or for sport....

Homalopoma maculatum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell grows to...

entrance. Some species, specifically S. minor and S. psittacina, have opercula that hang low over the pitcher entrance. These are also studded with chlorophyll-free...

Argalista glareosa is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Subspecies Argalista...

Tricolia milaschewitchi is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

Argalista umbilicata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the...

diamonds forming rosettes of rubies and emeralds set in silver or gold opercula. It is a millennia-old jewel that is part of the trousseau of the Algerian...

Tricolia tomlini is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

psychologists. Males and females flare or puff out their gill covers (opercula) to appear more impressive, either to intimidate other rivals or as an...

(1990). "Double function of aptychi (Ammonoidea) as jaw elements and opercula". Lethaia. 23 (4): 325–331. Bibcode:1990Letha..23..325L. doi:10.1111/j...

name the rosy pheasant, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

the coral-red gibbula, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The length of the...

located on the abdomen) and resonating chambers, sometimes covered by opercula, are especially efficient mechanisms in the Cicadidae (and may include...

Homalopoma tapparonei is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The small, turbiniform...

Paraliotipoma sirenkoi is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell reaches...

11 segments in total, with 6 pairs of gill bearing flap-like appendage (opercula) located underneath its second to seventh segments. The last 3 segments...

few-ribbed dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. As attested by the...

Eulithidium cyclostoma is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

switch to ram feeding. They swim with their mouth wide open and their opercula fully expanded. Every several feet, they close and clean their gill rakers...

far back from the mouth, towards the top of the head. The gill plates (opercula), although present, are also not visible; they are overlaid by tough skin...

Eulithidium phasianella is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

is also not a true sea snail. Unlike almost all other snails that have opercula, this species breathes air. It is common in New Zealand. The thick shell...

Scotiomyia melanura Meuffels & Grootaert, 1997 – Papua New Guinea Scotiomyia opercula (Wei, 2006) – China Scotiomyia singaporensis Evenhuis & Grootaert, 2002...

Tricolia pulchella is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

Tricolia munieri is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

leaves, smooth opercula, and relatively large fruit; Eucalyptus oleosa subsp. corvina L.A.S.Johnson & K.D.Hill has slightly warty opercula, short peduncles...

Tricolia kochii is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

although in horseshoe crabs they persist as large plate-like limbs, called opercula or branchiophores[citation needed], bearing the book gills, and that function...

Hyolithida and the Orthothecida. Hyolitha have dorso-ventrally differentiated opercula, with the ventral surface of the shell extending forwards to form a shelf...

the berry dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the...

waigiensis. Scale bar is 10 mm (0.39 in). Vittina waigiensis shells and opercula Vittina waigiensis feeding on algae Vittina waigiensis is a part of ornamental...

Ditropis whitei is a species of land snails with opercula, terrestrial gastropods in the family Cyclophoridae. This species is endemic to Australia. Ponder...

Clea is a genus of freshwater snails with opercula, aquatic gastropod mollusks in the subfamily Anentominae of the family Nassariidae, a family, almost...

Genus Ochetoceras (1922). O'Connell also wrote New species of ammonite opercula from the Mesozoic rocks of Cuba (1921) using specimens collected by Barnum...

Eulithidium perforata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

be a jaw apparatus (mandibles), while others believe them to be paired opercula. If the latter is the case, then aptychi may have had a function similar...

Eulithidium substriatum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

Rhombipoma is a genus of small sea snails with calcareous opercula, marine gastropod mollusks in the family Colloniidae. Species within the genus Rhombipoma...

Homalopoma boffii is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The shell grows to a...

than a dozen hippopotamus teeth. Tortoise carapaces (upper shells). Murex opercula (possible ingredient for incense). Ostrich eggshells. Cypriot pottery....

Eulithidium pulloides is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

brachiopods and bivalve molluscs. Fossils have been found that resemble the opercula ("lids") used by snails to close the openings in their armor, and are attributed...

Argalista filifera is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The length of the shell...

propagation, the seeds may be soaked or otherwise treated to loosen the plugs (opercula) in order to improve germination. The trees are dioecious, so that normally...

radiate dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Rosenberg, G. (2012)...

Cantrainea panamensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. Shell small, trochiform...

orientalis) Akhalkalaki, southern Georgia: close-up of fruiting calyces, showing opercula (=lids) of pyxidial capsules Venation Physochlaina orientalis: foliage...

banded pheasant shell, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

Pictacollonia is a genus of small sea snails with calcareous opercula, marine gastropod mollusks in the family Colloniidae. Species within the genus Pictacollonia...

Collonista imperforata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The diameter of...

by 12–13 soft rays. The anal fin has two spines and 7–8 soft rays. The opercula tips are spined, and the anal fin has two spines. The pelvic fins are close...

Artiscollonia is a genus of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Artiscollonia fedosovi Poppe...

Kulicki (1990). Double function of aptychi (Ammonoidea) as jaw elements and opercula. Lethaia 23: 325–331. doi:10.1111/j.1502-3931.1990.tb01365.x Seilacher...

plates overhanging an elongate feature, likely analogous to the genital opercula and ducts. A small arched microtergite links the prosoma and opisthosoma...

Homalopoma clippertonense is a species of small sea snail, with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Generalist inhabiting limnic and fluval waters. B. sp. 2 HAM 4 Over 70 opercula Borysthenia B. sp. HAM 4 two almost complete shells Earliest record of...

Shell and opercula of Nerita peloronta...

Artiscollonia granulosa is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This marine species...

Tricolia insignis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

name the minute pheasant, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

50 cm and weight of 1.5 kg. Like them it has spines on the tips of the opercula and in the dorsal, pelvic, and anal fins, as well as sharing a similar...

Oligohalinophila is a genus of freshwater snails with opercula, aquatic gastropod mollusks in the subfamily Anentominae of the family Nassariidae. It is...

Cantrainea sunderlandi is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. Original description:...

Smallmouth Buffalo in Oklahoma Based on Otoliths, Pectoral Fin Rays, and Opercula". North American Journal of Fisheries Management. 43 (3): 618–627. doi:10...

Argalista rotella is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The height of the shell...

Argalista fluctuata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The small, rather solid...

opercularization caused by the underdevelopment of the anterior part of the opercula found in the fetal brain in the 32nd week. The anatomic basisFoix–Chavany–...

dorsal and anal fins, the latter having one or two spines. The gill covers (opercula) have one spine which may be sharp or blunt; some species also have a cutaneous...

remarkable fact may be mentioned. The majority of the individuals are without opercula, even without a trace of the pad-like gland or area from which the operculum...

toward the lateral surface of the brain is the operculum (meaning lid). The opercula are formed from parts of the enclosing frontal, temporal, and parietal...

Citations Bibliography oology The scientific study of eggs. operculum Plural: opercula. A membraneous, horny or cartilaginous flap covering the nares of some...

Colloniidae is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the clade Vetigastropoda. Genera in the family Colloniidae...

Opisthostoma is a genus of minute land snails with opercula, terrestrial gastropod mollusks or micromollusks in the family Diplommatinidae. Species in...

combination derived from Greek myo (‘shut’ or ‘close’), with reference to the opercula that close off the tympanal cavity, and psalta (from Latin psaltria - a...

Eulithidium variegatum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant...

Argalista fugitiva is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The length of the shell...

Rhombipoma rowleyana is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The height of the...

cost. Many fish will make their heads look larger by pushing out their opercula, but this also makes it difficult to breathe. Aggressive behaviors might...

bridging the lateral sulcus between the frontal, temporal, and parietal opercula. The cistern contains the middle cerebral artery (MCA) and its branches...

Depressipoma is a genus of small sea snails with calcareous opercula, marine gastropod mollusks in the family Colloniidae. Species within the genus Depressipoma...

Homalopoma mimicum is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. This species occurs...

Botany. It is similar to E. urophylla but has narrower leaves, shorter opercula and larger fruit. This eucalypt is one of only four species only occurring...

Tricolia ios is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails. This...

whose males possess rounded opercula, and those in the western and southern United States, whose males possess pointed opercula. "Diceroprocta Report". Integrated...

western coast of the Americas into the northern Pacific Ocean. Radulae and opercula morphology is similar between Penion and Kelletia. † Kelletia brevis (Ozaki...

studied other structures to age fish. He discovered annuli in the vertebrae, opercula, and pectoral girdle and published his findings in Heicke 1905. The works...

from other genera of ronquils by having naked, i.e. scaleless, cheeks and opercula. there are 5 or 6 pores on the mandibles and the pores on the preoperculum...

Liotipoma magna is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The size of the shell varies...

Argalista nana is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. A. nana reaches a width...

prominent face with a black stripe in the middle, and more distinctly narrow opercula. Its tibia is tinted brown at the apex, its tegmina is narrower, and its...

plaque-shaped centriole-like body. Their cysts lack preformed pores or opercula. Protacanthamoeba contains 3 species: Protacanthamoeba bohemica Dyková...

—The forepart of the head, the interorbital space, the margins of the opercula and the bases of the pectorals are naked. The body is covered on both sides...

not erect, stamens in bud, down-turned bud clusters and short rounded opercula, not long and horn-shaped. Eucalyptus utilis was first formally described...

red glandular processes present in axils; and pollen tricolporate with opercula and no definite endoaperture." Ross JH, Crisp MD (2005). "Brongniartieae"...

section Bisectae subsection Glandulosae. This section has buds with two opercula and the cotyledons are bisected and the branchlets have numerous oil glands...

Tricolia tristis is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails...

commonly smooth and round, except for a few species where they have pointed opercula. Egg capsules can reach thousands; in a study the number of eggs for each...

serpentine), a pierced deer spittoon, and three Pomatias elegans snail opercula. The funerary objects have been dated to the Chalcolithic period ("Copper...

wide as long with a short, narrow median scape delimiting two trianguloid opercula. "Ornodolomedes mickfanningi Raven & Hebron, 2018". World Spider Catalog...

Shell & opercula of Nerita peloronta...

Pomatiidae, Aciculidae, Cyclophoridae, and others. These land snails have opercula, which helps identify them as "winkles gone ashore", in other words, snails...

areas, candy basslet court by swimming parallel to each other with their opercula in contact. The spawn of other Epinephelinae are carried by currents towards...

possess antibiotic properties. It is not unusual for the animal to have two opercula. Both serpulid and sabellid worms have radioles, but sabellids (such as...

two-faced dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The white-glossy...

gill rakers on the first gill arch. There are no flaps in between the opercula. The overall colour is brownish with a number small dark spots on the upper...

side of opisthosomal segment 2 to 9 covered by series of lung-bearing opercula (2 and 3) and curved sternites (4 to 9). The first segment apparently lacking...

sheen. The abdomen is pale yellow below and brown between the pulmonary opercula, with the dorsal surface dark. Legs and sternum are reddish-brown, with...

comparisons, but because African bush elephants are able to dislodge the opercula of marula fruit seeds, they must be able to exert at least 2,700 N (610 lbf)...

some are thicker and more distinguished than others. Four "lids" called opercula create a pyramid over the calyx that could be opened in life. These lids...

green-purple scales and display purple opercula, as shown in the right image. The color in females is plainer with spotted opercula. Its size is dependent on how...

yellowish red. They are paler brownish beneath, with the genital plate and opercula testaceous. The carapace is coarsely rugose, with a total length of 9 mm...

Smallmouth Buffalo in Oklahoma Based on Otoliths, Pectoral Fin Rays, and Opercula". North American Journal of Fisheries Management. 43 (3): 618–627. Bibcode:2023NAJFM...

described by J.A., Thomson in 1908. This species occurs in New Zealand. The opercula of species of Bolma are oval, circular or intermediate in shape. Almost...

Rolled together. Cordate – Heart-shaped. Corneous – Horn-like, as the opercula of some gastropods. Corrugated – Roughened by wrinkles. Costate – Having...

maxilla. They have large closely placed eyes. There are two spines on the opercula and one on subopercula. They have tiny conical teeth on the mandibles and...

coli strains, the bacteria are seen to gather specifically around the opercula, which are located at the poles of the eggs. The bacteria contain type...

Liotipoma solaris is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The shell grows to a...

large eyes than can appear dark in low light or red in bright light. The opercula or gill covers on Australian bass carry extremely sharp flat spines that...

resorbed. Unlike most other gastropods, neritomorphs typically have calcified opercula. There is no operculum in the shellless Titiscania, and the Phenacolepadidae...

identified by their relatively large globose shells and concentrically marked opercula. The shell is conical and thin but solid, with a sharp apex and relatively...

is opening the mouth wide, expanding the corner of the mouth and the opercula, erecting the dorsal fin, holding the flared pectoral fins at a right angle...

Argalista crassicostata is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae. The length of the...

color may be iridescent blue, with gold appearance in the vicinity of the opercula. A variable black margin may be present on the pale dorsal and caudal fins...

with dark central and proximal areas containing a black pattern. The opercula (hard shell-like flaps on the underside of the abdomen) are flesh colored...

tiny scales. The operculum is brown and horny, and it corresponds to the opercula typical of the genus Purpura. The seas snail is found along the Eastern...

to the fishes' body surfaces including areas of the fins, eye, mouth, opercula, and sometimes the gills,. Following attachment to their host fish, the...

anorexia and shortness of breath indicators such as lethargy or flared opercula. Fresh gill biopsies can be observed under the microscope for amoebas,...

Liotipoma lifouensis is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae. The shell grows to...

the region. Hundreds of opercula of the terrestrial gastropod Revoilia guillainopsis have been produced at Porc-Epic. The opercula has a central perforation...

white on the belly Black pigment outlines the scale pockets dorsally; the opercula and cheeks may be pinkish Breeding males develop fine, sandpaper-like nuptial...

referred to as "nits". These nits have small holes for gas exchange, called opercula. Typically, eggs will hatch within 12–14 days, but this varies depending...

carapace which includes the eyes. Operculum or branchial operculum (plural opercula): One of the plates on the ventral surface of the abdomen, just in front...

traits. The males will approach each other head-on, and exhibit flaring opercula and gular areas—very similar to cichlid or betta behavior. They will then...

coloration. The flanks and breast are pale yellow to bluish as are the lower opercula and sub-opercular region of the head. The flanks are blackish in aggressive...

strong exoskeletal armour. Their eyes are dark brown. They have yellowish opercula that extend laterally well beyond the body. The female is slightly larger...

on the lack of septa and vesiculae, as well as the presence of multiple opercula and an aragonitic mineralogy in some species. Khmeria is a bilaterally...

with calcareous opercula, marine gastropod mollusks in the family Colloniidae. C. obesa A genus of small sea snails with calcareous opercula, marine gastropod...

expanded at the sides. This genus is notable for the extraordinarily large opercula covering the tymbals and extending down much the abdomen in male insects...

poma roughly translates to the English "cover", referring to the fishes' opercula, and kentron is Greek for sting. The name refers to the serrations found...

Smallmouth Buffalo in Oklahoma Based on Otoliths, Pectoral Fin Rays, and Opercula". North American Journal of Fisheries Management. 43 (3): 618–627. Bibcode:2023NAJFM...

periorbital and intraocular area, the base of fins, the perianal region, the opercula, and the buccal region. In further studies, swollen abdomens and anal prolapsus...

aquatic and terrestrial species. The genus was named for their rostrate opercula. The type species of this genus is Rhynchostegium confertum (Dicks.) Schimp...

snow-shoe-like termination. The opisthosoma possess (possibly 6) pairs of opercula with setose distal regions and possible evidence of book gills. Based on...

distinct curve to the forehead, and a distinct "hump" above the head. The opercula or gill covers possess a small, flat spine sharp enough to cut unwary fishermen's...

Karri is a part of the Symphyomyrtus subgenus, all of which have two opercula on the buds and have four rows of ovules. It is not closely related to...

tail region. They have a pair of prominent eyes, nares, and developing opercula. The mouth opening, including the upper and lower jaw sheath, is completely...

caudate nuclei and putamen. In Fig.c T2-weighted images demonstrated enlargement of the Sylvian fissures caused by hypoplasia of the temporal opercula....

wide in the holotype. No lateral spines are observed. Poorly preserved opercula are present in the holotype. The telson is rarely entirely preserved. Complete...

after Phase I. Spoons and scrappers made from green turban shells or their opercula are very common. A great variety of shells are used to make beads and pendants...

blunt. When guarding eggs, the females develop large dark patches on the opercula, sides or abdomen, which may be mirrored in males, although it is often...

Females have much-reduced black abdominal markings compared to males. The opercula (the plates covering the tymbals) in males are pale green to yellow, broadly...

broad mesial dorsal area, and the area between the first pair of lung-opercula purplish-black. The sternum is more or less infuscate, darker than the...

suffusion covers the anterior distal half of the opercula, which are wide and rounded. The opercula are pale yellow. Sternum is golden brown to midbrown...

dark ventral abdominal tubercles on third and fourth sternites. The male opercula are rather short and generally do not reach beyond the posterior pair of...

operculum is the trap door of a shell, called by the Latins Conchylium. These opercula may be of different sizes, but their overall shape is that of a claw, which...

Academy of Natural Sciences, Philadelphia G.B. Sowerby III, Note on the opercula of Turbo pulcher, Reeve, and Turbo ticaonicus Reeve; Proceedings of the...

have cotyledons with two lobes, flower buds in leaf axils and with two opercula, stamens with versatile anthers and flattened seeds with a ventral hilum...

highly complicated one, with intermediate steps easily traceable. All opercula possess a basal chondroid plate (cartilaginous base) upon which calcareous...

raising its tongue against the roof of its mouth, forming a tube. The opercula then close quickly, pressurizing water along the tube. Most archerfish...

a small siphonal canal or siphonal notch at the base of the aperture. Opercula are paucispiral and corneous, but may be vestigial in some species, not...

becomes black with age or when exposed. Asci of Ruhlandiella do not contain opercula and range from 180 to 430 μm in length. The ascospores are hyaline, globose...

pitcher plants are unusual among pitcher plants in that they lack lids (opercula), instead having a small "nectar spoon" on the upper posterior portion...

cortex deep in the lateral fissure with the secondary taste areas in the opercula. The peripheral taste system likely maintains a specific relationship between...

whorl. This makes it an exception within the family Potamididae, where the opercula of the shells are flexicaudent. Telescopium telescopium shells are either...

sternum and coxae of the third and fourth legs paler as well as the lung opercula and spinnerets. The eye area is short. The posterior row of eyes is straight...

translucent layer meets the inner nacreous (mother-of-pearl) layer. Two isolated opercula, which are likewise concave on the outside toward the center because the...

nearly twice as long as the calyx. At maturity, it opens via two apical opercula (holes). The seeds are numerous and discoid, with a membranous wing (winged...

wider than the obconically shaped hypanthium located below. When the outer opercula is shed a scar is left. The stamen are flexed irregularly and contain an...

the Cyclostomacea with remarks in its affinities and notes on several opercula". Annals and Magazine of Natural History. 2nd Series. 14 (84): 411–418...

segments. The side margins of the pronotum are moderately dilated. The gill opercula have a diagonal rib and the anterolateral angles of the mesonotum have...

extensus meaning "stretched out or extended" in reference to the long opercula on the buds. This mallet occurs on sandplains and undulating areas along...

contain the fusulinids Wedekindellina euthysepta and Fusulina distenta. Opercula of cephalopods (possibly Liroceras) have been found in the formation, as...

the Destitutae subsection. Members of this subsection have buds with two opercula and branchlets where the pith is lacking in oil glands. E. rhodantha is...

coral-inhabiting snail Coralliophila violacea from the growth striae on opercula and a mark-recapture experiment". Marine Biology. 140 (2): 337–342. doi:10...

for various decorative purposes, including in jewelry and buttons. These opercula are sometimes known as "cat's eyes". Notes Linnaeus C. (1758). Systema...

hymenial grooves and depressions the asci were curved outwards so that their opercula must have faced the strongest rays of light to which the ends of the asci...

properties. It is not unusual for the worms to have two crowns, and hence two opercula.[citation needed] Serpulids and sabellids are two families of the Sabellida...

microfossils from Belgian Oligocene sediments are serpuloidean, not gastropod opercula". Cainozoic Research. 22 (1): 37–43. Stock, C. W. (2022). "Rare stromatoporoids...

surrounding New Zealand and Antarctica., as well as Serratifusus. Radulae and opercula morphology is similar between Penion and Kelletia. It is possible that...

the Destitutae subsection. Member of this subsection have buds with two opercula and have no oil glands in the pith of the branchlets. E. salmonophloia...

and also report the oldest known hyolith muscle scars preserved on the opercula of this species. A study on the feeding strategies and locomotion of Cambrian...

Georgieva et al. (2019). A study on the microstructure of hyolith conchs and opercula from the lower Cambrian Xinji Formation of North China, and on its implications...

oniscicolor (Viereck, 1904) Andrena opacifovea Hirashima, 1952 Andrena opercula Wu, 1982 Andrena optanda LaBerge, 1967 Andrena oralis Morawitz, 1876 Andrena...

Zhang, Y.; Xie, K.; Li, Z. (2021). "New Discovery of Oligocene Gastropod Opercula from the Yehucheng Formation in Northwestern China". Acta Geologica Sinica...

Trochidrobia have smooth and thin periuoostraca, and thin, simple and oval-shaped opercula. There are currently four species described in the genus Trochidrobia:...