Oophana laevis (Blanford, 1899)

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 laevis (Blanford, 1899)

Fig. 7E

Streptaxis laevis Blanford, 1899: 765, pl. 50, figs 11-12. Type locality: Tenasserim [probably Tanintharyi Region, Myanmar]. Gude 1903: 218. Blanford and Godwin-Austen 1908: 13.

Streptaxis (Odontartemon) laevis - Kobelt 1905: 93, 94, pl. 60, figs 11, 12.

Odontartemon (Oophana) laevis - Kobelt 1910: 150.

Indoartemon laevis - Richardson 1988: 225. Siriboon et al. 2014b: 163.

Material examined.

Possible syntype NHMUK 1899.7.4.11 (1 shell; Fig. 7E ) ex. Beddome collection from Burma [ Myanmar] .

Diagnosis.

Oophana laevis differs from O. mouhoti and O. obtusus by having a rounded penultimate whorl, convex spire, and apertural dentition with parietal and basal lamellae. Although O. mouhoti and O. obtusus have a slightly angular penultimate whorl and elevated spire, O. mouhoti usually has only a parietal lamella (sometimes with basal lamella). In contrast, O. obtusus has parietal, palatal, and columellar lamellae.

Description.

Shell oblique-heliciform, white, and translucent; whorls 5½; spire low convex with distinct suture. Shell surface glossy with transverse ridges that diminish below periphery. Embryonic shell ~ 2½ whorls with smooth surface; following whorls regularly coiled. Shell periphery rounded; last whorl axially deflected. Aperture subquadrangular with sinulus; peristome discontinuous, thin, expanded and reflected. Apertural dentition with one parietal and one basal lamella, and sometimes columellar lamella is absent. Umbilicus open and shallow (Fig. 7E ).

Distribution.

This species is known only from the type locality, which was mentioned only as ‘Tenasserim’ (Blandford 1899). This locality possibly refers to the Tanintharyi Region, southeastern Myanmar.

Remarks.

No new specimens were collected in this study. However, we compared the possible type specimen with the other congeners. Blanford (1899) clearly stated that the type series was collected by Beddome and consisted of three specimens. However, the NHM, London holds a lot of only a single specimen from the Beddome collection, with the word India, probably added at a later date, on the label. Therefore, we consider this lot to be a possible syntype.

Figures

Figure 7. A, B Oophana mouhoti A possible syntype NHMUK ex. Cuming collection from Camboja and B specimen CUMZ 13005 from Phra (Buddha) Cave, Tanintharyi C, D Oophana obtusus C specimen NHMUK 1888.12.4.788 - 790 from Chauktalon, Moulmein with apertural dentition and D specimen NHMUK 1871.9.23.64 from Moulmein E Oophana laevis, possible syntype NHMUK 1899.7.4.11 from Burma.