Pupina dorri isanensis 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

Pupina dorri isanensis Jirapatrasilp ssp. nov.

Figs 36K, L , 39E, F

Type material.

Holotype CUMZ 12140/1 (Figs 36K , 39E ), 31 Aug. 2020, coll. C. Sutcharit, P. Jirapatrasilp, A. Pholyotha. Measurement: shell height 6.6 mm, shell width 4.6 mm and 5½ whorls. Paratypes CUMZ 12140/2 (22 shells) and NHMUK 20210337 (3 shells), same data as holotype.

Type locality.

Pa Pha Ya Temple, Suwannakhuha District, Nong Bua Lam Phu Province, Thailand, 17°37'38.8"N, 102°10'13.7"E, 250 m amsl.

Other material examined.

CUMZ 12137 (1 shell; Figs 36L , 39F ) from Khao Wang Pha, Na Wang District , Nong Bua Lam Phu Province, 15 Oct. 2007 . CUMZ 12138 (1 shell) from Pa Jor Cave , Na Wang District, Nong Bua Lam Phu Province, 15 Oct. 2007 . CUMZ 12139 (9 shells) from Tham Suwannakhuha Temple, Suwannakhuha District , Nong Bua Lam Phu Province, 31 Aug. 2020 . CUMZ 12141 (2 shells) from Namtok Thao To Forest Park, Mueang Nong Bua Lam Phu District, Nong Bua Lam Phu Province, 31 Aug. 2020 . CUMZ 12142 (3 shells and 1 specimen in ethanol) from Phu Pha Lom, Mueang Loei District , Loei Province, 1 Sept. 2020 . CUMZ 12143 (1 specimen in ethanol) from Hin Pha Ngam Park, Nong Hin District , Loei Province, 2 Sept. 2020 . CUMZ 12144 (1 shell) from Phraya Nakharaj Cave , Phu Pha Man District, Khon Kaen Province, 21 July 2020 . CUMZ 12145 (1 specimen in ethanol) from Phu Thong Thep Nimit Temple, Nong Saeng District , Udon Thani Province, 30 Aug. 2020 . CUMZ 12170 (1 shell) from Khao Wong Cave , Kaeng Hang Maeo District, Chanthaburi Province, 15 Sept. 2009 .

Diagnosis.

Shell ovate-fusiform; last whorl ca. 70% of shell height. Apertural lip thickened but not expanded. Parietal tooth triangular, thickened, covering posterior canal, approaching but not extending beyond the outer margin of apertural lip; columellar tooth fin-shaped, thickened, located next to slit-like anterior canal.

Differential diagnosis.

This new subspecies is slightly different from the nominotypical subspecies in having the apertural lip, and parietal and columellar teeth more thickened.

Description.

Shell height 6.0-6.6 mm; shell width 4.2-4.6 mm. Shell ovate-fusiform, solid, semi-transparent, grey to pale brown, devoid of prominent sculpture on glazed smooth surface. Apex obtuse. Growth lines on shell surface inconspicuous. Whorls 5½, last whorl large (ca. 70% of shell height). Spire angle ca. 75-80°, slightly extended. Sutures slightly impressed, but shallow. Aperture circular; lip thickened (ca. 0.2 mm wide and 0.3-0.4 mm thick) with paler colour, not expanded. Parietal callus not sharply defined and somewhat thickened with paler colour. Peristome interrupted by two canals; posterior canal slit-like ca. 0.7 mm long; anterior canal slit-like continuing horizontally ca. 0.8-0.9 mm. Parietal tooth triangular, thickened (ca. 0.7 mm long, 0.5 mm at its widest and 0.3 mm thick), covering posterior canal, approaching but not extending beyond the outer margin of apertural lip. Columellar tooth thickened (ca. 1.0 mm long, 0.3 mm at its widest and 0.3 mm thick), fin-shaped. Umbilicus closed. Operculum round, thin, flat, multispiral, whitish to pale yellow, opaque corneous with smooth edge.

Etymology.

The specific epithet refers to the Thai name “Isan” for the northeastern region of Thailand, where this new subspecies is mainly distributed.

Distribution.

Northeastern and eastern Thailand.

Remarks.

Although the collecting localities of this new subspecies are ca. 600 km from the known occurrence of the nominotypical subspecies, DNA data and morphometric analyses are required to demonstrate whether these Thai specimens are distinct from the Vietnamese specimens and should be elevated to specific status.

Figures

Figure 36. Shells of Pupina aureola species group from mainland Southeast Asia A-F Pupina aureola A possible syntype NHMUK 1988.12.4.101 and specimens B CUMZ 12124 C CUMZ 12126 D CUMZ 12130 E CUMZ 12133, and F CUMZ 12121 G, H Pupina stoliczkai sp. nov. G holotype CUMZ 12147 / 1 and H paratype NHMUK 20210336 I, J Pupina dorri dorri I paralectotype MNHN-IM- 2000 - 35836 and J specimen NHMUK ex. A. J. Piele Colln. Acc. No. 2242 K, L Pupina dorri isanensis spp. nov. K holotype CUMZ 12140 / 1 and L specimen CUMZ 12137 M Pupina brachysoma, lectotype MNHN-IM- 2000 - 9652. Photo: P. Maestrati, MNHN (I, M)

Figure 39. A, B Pupina paviei: specimens A NHMUK ex. Dautzenberg coll. from Kampot, Cambodge and B CUMZ 12134 from Lalu, Sa Kaeo C, D Pupina tchehelensis: specimens C SMF 109947 / 6 from Bukit Pondong, Perak and D CUMZ 12136 from limestone mountain, Phang Nga E, F Pupina dorri isanensis ssp. nov. E holotype CUMZ 12140 / 1 and F specimen CUMZ 12137 from Khao Wang Pha, Nong Bua Lam Phu.