Carinartemis petitii (Gould, 1844)

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

Carinartemis petitii (Gould, 1844)

Fig. 17A, B

Streptaxis petitii Gould, 1844: 456, 457, pl. 24, fig. 7. Type locality: Tavoy [Dawei District, Tanintharyi Region, Myanmar].

Streptaxis petiti [sic] - Pfeiffer 1876: 8. Hanley and Theobald 1870: 4, pl. 8, fig. 4. Nevill 1878: 3. Tryon 1885: 74, pl. 14, figs 16-18. Gude 1903: 216. Kobelt 1910: 151, 152. Blanford and Godwin-Austin 1908: 4.

Haploptychius petiti [sic] - Kobelt 1906: 142, pl. 57, fig. 14. Richardson 1988: 218.

Haploptychius petitii - Siriboon et al. 2020: 7, 14, 16, fig. 3.

Material examined.

Syntype MCZ 169290 (1 shell; Fig. 17A ) from Burmah. Moulmein: NHMUK 1909.3.15.67 (2 shells, Fig. 17B ) ex. Godwin-Austen collection. NHMUK 67.9.3.15 (1 shell) ex. Blanford collection.

Diagnosis.

Carinartemis petitii can be distinguished from C. sankeyi (Benson, 1859) by having a fine transverse ridge on the upper periphery, penultimate whorl keeled and little extended beyond the diameter of last whorl, and a subcircular aperture. In addition, C. petitii differs from I. medius from Thailand by having a more axially deflected last whorl, and only one parietal lamella present, while I. medius has a less axially deflected last whorl, and with one additional small palatal lamella. Carinartemis petitii is superficially similar to H. blaisei but it has an elevated spire, keeled penultimate whorl, subcircular aperture, and thicker lip.

Description.

Shell oblique-heliciform, white, and translucent; whorls 6½ -7; spire conical with distinct suture. Shell surface glossy with fine transverse ridges, nearly smooth with a few transverse ridges near peristome. Embryonic shell ~ 2½ whorls with smooth surface; following whorls regularly coiled. Shell periphery keeled nearly the entire penultimate whorl; last whorl axially deflected. Aperture subcircular; peristome discontinuous, thickened, expanded, and reflected. Apertural dentition with one strong parietal lamella. Umbilicus open and deep (Fig. 17A, B ).

Distribution.

This species is known from the type locality in Myanmar ( Gould 1844) and Kanchanaburi Province in Thailand ( Siriboon et al. 2020).

Remarks.

No new specimens were collected in this survey. However, the syntype (Fig. 17A ) and the museum specimens (Fig. 17B ) show slightly different shell forms. Carinartemis petitii is similar in shell form to the genus Haplotychius in having one parietal lamella and a deflected last whorl. However, an initial molecular analysis placed this species within the Carinartemis clade ( Siriboon et al. 2020). This species is clearly distinct from other recognized Carinartemis species by its oblique-heliciform shell, translucence and a high to low conical spire with a distinct suture. Moreover, the shell surface has fine transverse ridges that diminish below periphery, whorls regularly coiled, shell periphery is keeled; umbilicus open and deep. Aperture is semi-ovate, peristome thickened, expanded, reflected, and apertural dentition with one strong parietal lamella.

Figures

Figure 17. A, B Carinartemis petitii A syntype MCZ 169290 from Tavoy, British Burmah and B specimen NHMUK 1909.3.15.67 from Moulmein C, D Carinartemis exacutus C specimen NHMUK 1888.12.4.771 - 773 from Moulmein with apertural dentition and D specimen CUMZ 13025 from Taung Wine Cave, Hpa-an, Kayin State with apertural dentition.