Hydaticus satoi

Hydaticus satoi
female
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Adephaga
Superfamily:	Dytiscoidea
Family:	Dytiscidae
Genus:	Hydaticus
Species:	H. satoi
Binomial name
Hydaticus satoi Wewalka, 1975

Hydaticus satoi, is a species of predaceous diving beetle found in India, Bhutan, Myanmar, Nepal, Sri Lanka, China, Indonesia, Japan, Philippines, Saudi Arabia, Taiwan and Thailand.^[1][2]

Subspecies

Two subspecies are identified.^[3]

• Hydaticus satoi dhofarensis Pederzani, 2003
• Hydaticus satoi satoi Wewalka, 1975

The subspecies dhofarensis has a length of 3.4 to 15.10 mm whereas subspecies satoi with a length of 12 to 14 mm. The subspecies dhofarensis is broader, broadest behind the middle and less tapering in front and behind than the nominate subspecies. Dorsum black with yellow pattern. Head yellowish in front and blackish behind. Pronotum widely yellowish laterally and black at the middle. There is a border line visible between black and yellow, which is slightly angulate at the middle. Elytra with yellow bands which are narrower and shorter than in ssp. satoi. Sometimes the outer band approaches the pre-apical yellow spot. Outer band is very narrow in melanistic specimens. The discal band is either absent or sometimes reduced to a short and narrow sub-basal stripe. Ventrum dark brown with yellow pro-sternal process. Legs and meso-femurs are yellowish anteriorly. Intermediate tibiae and tarsi are light brown, whereas posterior legs are dark brown in color. Palpi and basal half of antennae are yellowish. Dorsum covered by a dense and minute puncturation interspersed with larger punctures. Large puncture are usually found at the base of elytra. Submarginal rows of punctures are evenly found in pronotum, elytral rows and the sculpture of the ventrum.^[4][5]

Subspecies satoi has narrow yellow stripes in humeral and sub marginal areas. These stripes joined posteriorly after the middle.^[6] Female is about 13.8 mm long.^[7]

References

1. "Further Contribution on Diving Beetles from Maharashtra, India (Coleoptera: Dytiscidae)". Rec. zool. Surv. India : 115(Part-1) : 81-84, 2015. Retrieved 2021-08-07.
2. Sheth, Sayali D.; Padhye, Anand D.; Ghate, Hemant V. (2021). "Effect of environment on functional traits of co-occurring water beetles". Annales de Limnologie - International Journal of Limnology. 57: 2. doi:10.1051/limn/2020030. S2CID 234225837. Retrieved 2021-08-09.
3. "Hydaticus satoi Wewalka, 1975". www.gbif.org. Retrieved 2021-08-09.
4. "HYDATICUS SATOI DHOFARENSIS N. SSP. FROM OMAN" (PDF). Quad. Studi Nat. Romagna, 17 suppl.: l7-24, giugno200. Retrieved 2021-08-06.
5. Hájek, Jiří; Reiter, Antonín; Vondráček, Dominik (2021-04-03). "Molecular analysis and morphological variability confirm Hydaticus dhofarensis Pederzani, 2003 as the westernmost population of the Indomalayan H. bipunctatus Wehncke, 1876 (Coleoptera: Dytiscidae)". Zoology in the Middle East. 67 (2): 144–151. doi:10.1080/09397140.2021.1918191. S2CID 233745471. Retrieved 2021-08-09.
6. "Aquatic Beetles of Nayachar Island, East Midnapore District, West Bengal, India". Rec. zool. Surv. India : 113(Part-3): 93-95, 2013. Retrieved 2021-08-07.
7. "Hydaticus satoi". www.kaefer-der-welt.de. Retrieved 2021-08-09.