Big Anixa Snail (Helicostyla propitia)
The Big Anixa Snail species was described in 1907, it is endemic to the island of cebu, Philippines..
This is a rather large species with shells reaching up to 4 cm in diameter, it is closely related to Morelet’s Anixa Snail (Anixa moreleti) and differes from that species in being much larger, and having a thicker shell with a much lighter-colored epidermis. [1]
This species appears in lists of extinct species, but I’m not quite sure if it indeed is extinct, since other, closely related species, also having been considered extinct, subsequently actually rediscovered.
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References:
[1] Hugh C. Fulton: Descriptions of new species of Trochomorpha, Cochlostyla, Amphidromus, Bulimulus, Drymaeus, Placostylus, Stenogyra, Leptopoma, Cyclophorus, Cyclotus, and Alycaeus. The Annals and magazine of natural history; Zoology, Botany, and Geology ser. 7, Vol. 19(110): 149-157. 1907
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(public domain)
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edited: 17.06.2020