Oophana elisa (Gould, 1856)

Sian Man, Nem, Siriboon, Thanit, Lin, Aung, Sutcharit, Chirasak & Panha, Somsak, 2022, Revision of the carnivorous land snail family Streptaxidae (Stylommatophora, Achatinina) in Myanmar, with description of four new species, ZooKeys 1110, pp. 39-102 : 39

Oophana elisa (Gould, 1856)

Streptaxis elisa Gould, 1856: 13. Type locality: an island in the Mergui Archipelago. Pfeiffer 1868: 448. Blanford and Godwin-Austin 1908: 14.

Odontartemon elisa - Kobelt 1906: 126.

Perottetia elisa - Kobelt 1910: 151.

Oophana elisa - van Benthem Jutting 1954: 96. Richardson 1988: 234, 235. Clements 2006: 126.

Remarks.

The shell is oblique-heliciform with convex spire and a distinct suture. Whorls 7 and shell surface with transverse ridges that diminish below the periphery. Shell periphery is keeled, and last whorl axially deflected. Umbilicus open and deep. Aperture is subquadrangular, peristome reflected. Apertural dentition with one parietal, one basal, two weak palatal, and one columellar lamella.

This species is known only from the type locality, in the southern part of Myanmar. No fresh materials were collected in this survey. Herein, the description of this species is based only on the original description. Gould (1856) received the specimen from Rev. J. Benjamin and described it without providing any figures. In the description, Gould compared O. elisa with two species: Seychellaxis souleyetianus (Petit, 1841) and Haploptychius pyriformis (Pfeiffer in Philippi, 1845). In differentiating the three, Gould noted that O. elisa has a larger and a more depressed shell than S. souleyetianus , and that O. elisa has a more elongated shell that is two-fold larger in size and posterior denticle (presumably parietal lamella) smaller than H. pyriformis . Based on this comparison, we assume that the shell of O. elisa differs from all other known congeners from Myanmar and Peninsular Malaysia by its largely deflected last whorl, discoid spire and keeled penultimate whorl. Besides probably having the same distribution range, O. elisa is similar to D. paurodeviatus sp. nov. in having a quite straight and parallel aperture lip, and four apertural dentitions. However, O. elisa seems to have an oblique-ovate shell with more deflected last whorl, keeled penultimate whorl, and discoid spire. Meanwhile, D. paurodeviatus sp. nov. possesses a globose shell with less deflected last whorl, and penultimate whorls being rounded. To date, no specimens or illustrations have been found after the first record.