Oophana mouhoti (Pfeiffer, 1863)

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 mouhoti (Pfeiffer, 1863)

Figs 1 , 7A, B

Streptaxis mouhoti Pfeiffer, 1863 [1862]: 273. Type locality: Siam [Thailand]. Martens 1867: 84, pl. 22, fig. 22. Pfeiffer 1868: 446. Nevill 1878: 4. Tryon 1885: 80, pl. 15, fig. 46. Bourguignat 1889: 133.

Streptaxis johswichi Martens, 1864: 528. Type locality: Siam, bei Petchaburi [Petchaburi Province, Thailand].

Streptaxis mouhoti var. johswichi - Martens 1864: 528. Pfeiffer 1868: 446.

Gonaxis mouhoti - Bourguignat 1889: 133.

Odontartemon (Oophana) mouhoti - Kobelt 1906: 104, 105, pl. 55, fig. 23.

Oophana mouhoti - Richardson 1988: 235, 236. Siriboon et al. 2020: 5, 14, 15.

Material examined.

Possible syntype NHMUK ex. Cuming collection (3 shells; Fig. 7A ) from Camboja [ Cambodia]. NHMUK ex. Cuming collection (2 shells) from Siam. Phra (Buddha) Cave , Tanintharyi Region, Myanmar (11°14'01.5"N, 99°10'42.8"E): CUMZ 13005 (1 shell; Fig. 7B ) .

Diagnosis.

Oophana mouhoti can be distinguished from O. obtusus (Stoliczka, 1871) by its higher spire, expanded aperture lip, deflected last whorl, and slightly angulate penultimate whorl. In contrast, O. obtusus exhibits a narrow aperture, spire convex, periphery of penultimate whorl usually equal to last whorl, strong columellar lamella, and small tubercle near the posterior angle of aperture.

Description.

Shell oblique-ovate, white, and translucent; whorls 6½; spire elevated conical with distinct suture. Shell surface glossy with fine transverse ridges that diminish below the periphery; following whorls regularly coiled. Shell periphery rounded and last whorl axially deflected. Aperture subcircular; peristome expanded, thickened, discontinuous, and reflected. Apertural dentition with one strong parietal, one small upper palatal, one small palatal, and one basal lamella. Umbilicus open and deep (Fig. 7A, B ).

Distribution.

This species has been recorded from several localities in Peninsular Thailand ( Siriboon et al. 2020) along the southeastern part of the Tenasserim Range. However, only one specimen was collected in Myanmar from the Tanintharyi Region.

Remarks.

The only shell was collected from the limestone hills at Buddha Cave, Tanintharyi Region; it matches well with this species.

Oophana mouhoti was originally described based on specimens in the collection of H. Cuming with the very brief collection locality given as Siam. The NHM, London holds a lot of three specimens in the Cuming collection collected by H. Mouhot but has Camboja as the collection locality. This specimen lot does not have Pfeiffer’ handwriting on the label; therefore, they are considered possible syntypes. However, Mouhot’s recorded localities were generally imprecise. No additional specimens for this species are available, nor are records or literature references from Cambodia, other than peninsular Thailand ( Sutcharit et al. 2020). A similar situation of imprecise type locality records with Mouhot-collected specimens have been clarified in the case of helicarionid species (see Pholyotha et al. 2020). The recent works on land snails from Thailand confirmed that the specimens from the limestone hills along peninsular Thailand identified as O. mouhoti match well with the possible syntype. Therefore, peninsular Thailand (Petchaburi and Prachuap Khiri Khan provinces) are possibly the collecting locality for this species. Furthermore, H. Mouhot visited Petchaburi Province once from May to August in 1860 [see travel routes map in Mouhot (1864a, b)]. Additionally, Streptaxis johswichi Martens, 1864 was described based on specimens collected from Petchaburi Province, Thailand. Later, Martens (1867) examined the O. mouhoti specimens in the Cuming collection and agreed that they belonged to the same species.

Figures

Figure 1. Approximate sampling locations used in this study. The location name and coordinates are listed in Table 1. Historical type localities of a broad scale, such as Tavoy, Burma, Moulmein, Mergui, and Tenasserim, are not indicated on this map.

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.