Plectostoma sciaphilum

Plectostoma sciaphilum
Conservation status
Extinct  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Architaenioglossa
Superfamily:	Cyclophoroidea
Family:	Diplommatinidae
Genus:	Plectostoma
Species:	†P. sciaphilum
Binomial name
†Plectostoma sciaphilum (van Benthem-Jutting, 1952)

Plectostoma sciaphilum is an extinct species of land snail in the family Diplommatinidae.^[2] This species was originally found on a single limestone karst at Bukit Panching (3°53'28"N, 103°8'26"E), in Peninsular Malaysia. This species was last observed around 2003 before quarrying destroyed its only known habitat. Plectostoma species are allopatric, found in dozens of isolated karst hills where few species occur, meaning that limited gene flow exists and only negligible hybridization occurs. Shell is distinctly convex, tuba shape similar to that of Plectostoma senex and P. turriforme, but this species lacks basal constriction teeth. Additionally, studies show that Plectostoma species evolved unique shell traits—like dense ribs and thicker walls—as defenses against predators, indicating a complex evolutionary adaptation within this genus. Shell height: 2.6–2.9 mm, width: 1.5–1.6 mm

References

1. Thorseng, L. (2015). "Plectostoma sciaphilum". IUCN Red List of Threatened Species. 2015: e.T168180A77504770. doi:10.2305/IUCN.UK.2015-1.RLTS.T168180A77504770.en. Retrieved 1 July 2024.
2. Liew, Thor-Seng; Vermeulen, Jaap Jan; Marzuki, Mohammad Effendi; Schilthuizen, Menno (2014-03-25). "A cybertaxonomic revision of the micro-landsnail genus Plectostoma Adam (Mollusca, Caenogastropoda, Diplommatinidae), from Peninsular Malaysia, Sumatra and Indochina". ZooKeys (393): 1–107. Bibcode:2014ZooK..393....1L. doi:10.3897/zookeys.393.6717. ISSN 1313-2970. PMC 3974427. PMID 24715783.