Pseudopomatias doiangkhangensis Jirapatrasilp, 2022

Jirapatrasilp, Parin, Sutcharit, Chirasak & Panha, Somsak, 2022, Annotated checklist of the operculated land snails from Thailand (Mollusca, Gastropoda, Caenogastropoda): the family Pupinidae, with descriptions of several new species and subspecies, and notes on classification of Pupina Vignard, 1829 and Pupinella Gray, 1850 from mainland Southeast Asia, ZooKeys 1119, pp. 1-115 : 1

Pseudopomatias doiangkhangensis Jirapatrasilp sp. nov.

Fig. 9C, D

Type material.

Holotype CUMZ 12165/1 (Fig. 9C ), 24 Oct. 2015, coll. C. Sutcharit, R. Srisonchai, A. Pholyotha, T. Seesamut. Measurement: shell height 8.6 mm, shell width 4.3 mm and 7½ whorls. Paratypes CUMZ 12165/2-6 (5 shells), NHMUK 20210331 (2 shells), same data as holotype; CUMZ 5219, 5221, 16 Mar. 2000, coll. C. Sutcharit, S. Panha (2 shells; Fig. 9D ) from the type locality.

Type locality.

Doi Ang Khang, Fang District, Chiang Mai Province, Thailand, 19°52'09.6"N, 99°03'17.4"E, 1341 m amsl.

Diagnosis.

Shell ovate to ovate conical, widest at penultimate whorl; ca. 7½ whorls, with regular weak ribs. Area between ribs with very fine radial striation. Outer peristome expanded and reflected.

Differential diagnosis.

Pseudopomatias doiangkhangensis sp. nov. is similar to the ovate-shaped P. harli Páll-Gergely, 2015 ( Páll-Gergely et al. 2015), but differs in having more whorls, weaker ribs, and a wider apertural lip. In addition, the shell is widest at its penultimate whorl, compared to P. harli that is widest at its last whorl.

Description.

Shell height 8.8-9.2 mm; shell width 4.4-4.6 mm. Shell ovate to ovate conical, widest at penultimate whorl, solid, semi-transparent, pale orange. Whorls ca. 7½ with sutures deep. Protoconch ca. 2 whorls (slightly eroded), first ca. 1½ whorl very finely granulated; remaining whorls and teleoconch very finely, regularly ribbed every 0.2 mm; ribs weak and 0.1 mm wide. Area between ribs with very fine radial lines, visible only under high magnification (> 20 ×), getting weaker in earlier whorls. Last whorl with 28-30 ribs. Apex obtuse. Spire angle ca. 50°. Aperture rounded with very slightly angled columellar-parietal transition and more sharply angled parietal-palatal transition; outer peristome expanded and reflected (0.4-0.5 mm wide and 0.3 mm thick), white to pale pinkish in colour. Umbilicus closed. Operculum unknown.

Etymology.

The specific epithet is named after Doi Ang Khang, the type locality of this species.

Distribution.

Known only from the type locality.

Remarks.

This species exhibits infraspecific variation in shell shape from ovate to ovate conical (Fig. 9C, D ).

Figures

Figure 9. A, B Pseudopomatias caligosus: A holotype HNHM 100176 and B specimen CUMZ 12191 from Pa Tham Wua Temple, Mae Hong Son C, D Pseudopomatias doiangkhangensis sp. nov. C holotype CUMZ 12165 / 1 and D paratype CUMZ 5219 from Doi Ang Khang, Chiang Mai E, F Pseudopomatias pallgergelyi sp. nov. E holotype CUMZ 12167 / 1 F paratype CUMZ 12167 / 2 from Pha Daeng Cave, Mae Hong Son. Photo: B. Pall-Gergely (A).