Pupina bensoni 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 bensoni Jirapatrasilp sp. nov.

Figs 19A , 21W, X , 24G , 25D, E , 26A

Type material.

Holotype CUMZ 12045/1 (Figs 21W , 24G ), 5 June 2017, coll. C. Sutcharit, R. Srisonchai, A. Pholyotha. Measurement: shell height 8.5 mm, shell width 5.9 mm and 5½ whorls. Paratypes CUMZ 12045/2-10 (7 shells and 2 specimens in ethanol; Fig. 25D ) and NHMUK 20210333 (2 shells), same data as holotype; CUMZ 12046, 5 Dec. 2020, coll. P. Jirapatrasilp, C. Sutcharit, A. Pholyotha (14 shells and 2 specimens in ethanol; Figs 21X , 26A ), from the type locality.

Type locality.

Khao Wong Cave, Ban Rai District, Uthai Thani Province, Thailand, 15°01'53.1"N, 99°27'21.0"E, 246 m asl.

Other material examined.

CUMZ 12047 from Tham Namthip Bureau of Monks , Lan Sak District , Uthai Thani Province , 28 July 2016 (8 shells and 12 specimens in ethanol; Figs 19A , 25E ). CUMZ 12048 from Tham Namthip Bureau of Monks , Lan Sak District, Uthai Thani Province, 5 Dec. 2020 (7 shells and 7 specimens in ethanol) .

Diagnosis.

Shell ovate; last whorl ca. two thirds of shell height. Apertural lip thickened, not expanded to slightly expanded; with a furrow between inner and outer peristomes; inner peristome thickened and cord-like. Parietal tooth thickened, long trapezoid shaped, reaching beyond the middle of last whorl, outer border nearly straight, always covering posterior canal; columellar tooth thickened, curvedly triangular shaped, located next to slit-like anterior canal.

Differential diagnosis.

Pupina bensoni sp. nov. is most similar to P. hungerfordiana in having a long parietal tooth reaching beyond the middle of last whorl, but differs in the long, trapezoid shape of parietal tooth, with the outer border nearly straight, and a furrow between inner and outer peristomes, with the inner peristome thickened and cord-like.

Description.

Shell height 7.0-8.6 mm; shell width 4.0-6.0 mm. Shell ovate, solid, semi-transparent, whitish to brown, devoid of prominent sculpture on glazed smooth surface. Apex obtuse. Growth lines on shell surface inconspicuous. Whorl 5½ -6, last whorl large ca. two-thirds of shell height. Spire angle ca. 90°; somewhat extended. Sutures slightly impressed, but shallow. Aperture circular; lip thickened with paler colour (ca. 0.2-0.3 mm wide and 0.5-0.6 mm thick), not expanded to slightly expanded. Apertural lip with a furrow between inner and outer peristomes, with inner peristome thickened and cord-like. Parietal callus sharply defined and thickened with paler colour. Peristome interrupted by two canals; posterior canal ca. 1.5 mm long and 0.3 mm at its widest, continuing slightly obliquely forming narrow groove bordered by parietal tooth and extended part of apertural lip; anterior canal curved and slit-liked continuing horizontally ca. 1.7 mm. Parietal tooth thickened, long trapezoid shaped (ca. 2.0 mm high, 0.7 mm wide and 0.3 mm thick), outer border somewhat straight, located at angular corner of aperture, extending beyond apertural lip and reaching beyond the middle of last whorl, always covering posterior canal. Columellar tooth somewhat thickened, curvedly triangular shaped (ca. 0.9 mm high, 2.2 mm long and 0.3 mm thick), located next to anterior canal. Umbilicus closed. Operculum round, yellowish, transparent corneous with smooth edge.

Etymology.

The specific epithet is dedicated to W.H. Benson, an Irish malacologist, who made large collections of molluscs and described numerous species from India and Myanmar, especially the two oldest Pupina species from this region.

Distribution.

This new species is found from Uthai Thani Province, central Thailand.

Figures

Figure 19. Opercula of three mainland Southeast Asian Pupina species groups A Pupina bensoni sp. nov. from the Pupina artata species group, specimen CUMZ 12047 B Pupina siamensis from the Pupina arula species group, specimen CUMZ 12067, and C Pupina aureola from the Pupina aureola species group, specimen CUMZ 12116. All not to scale.

Figure 21. Shells of Pupina artata species group from mainland Southeast Asia A-M Pupina artata A syntype UMZC I. 102960. A and specimens B CUMZ 12011 C CUMZ 12023 D CUMZ 12038 E CUMZ 12026 F CUMZ 12015 G CUMZ 12009 H CUMZ 12001 I CUMZ 12003 J NHMUK 1906.4.4.28 K CUMZ 12037 L CUMZ 12031, and M CUMZ 12018 N, O Pupina pallens N lectotype SMF 109951 and O specimen CUMZ 12042 P-R Pupina limitanea P, Q syntypes NHMUK 1903.7.1.2967 and R specimen CUMZ 12044 S Pupina billeti, holotype MNHN-IM- 2000 - 35841 T Pupina verneaui, syntype MNHN-IM- 2000 - 35843 U, V Pupina hungerfordiana, specimens NHMUK 91.3.14.686 - 7 W, X Pupina bensoni sp. nov. W holotype CUMZ 12045 / 1 and X paratype CUMZ 12046 / 1. Photo: H. Taylor, NHM (A, P, Q), P. Maestrati, MNHN (S, T).

Figure 24. A Pupina artata, specimen CUMZ 12038 from Tham Suea Temple, Krabi B, C Pupina pallens B lectotype SMF 109951 and C specimen CUMZ 12042 from Suan Wiwek Bureau of Monks, Prachuap Khiri Khan D-F Pupina limitanea D, E syntypes NHMUK 1903.7.1.2967 from East of Burma & Siam and F specimen CUMZ 12044 from Mae Lana junction, Mae Hong Son G Pupina bensoni sp. nov., holotype CUMZ 12045 / 1. Photo: H. Taylor, NHM (D, E).

Figure 25. Live specimens of A-C Pupina artata: specimens A CUMZ 12020 from Buri Ratchawanaram Temple, Ratchaburi B CUMZ 12022 from Golden Dragon Cave, Ratchaburi, and C CUMZ 12037 from Wua Ta Lap Island, Surat Thani D, E Pupina bensoni sp. nov. D paratype CUMZ 12045 / 2 from Khao Wong Cave, Uthai Thani and E specimen CUMZ 12047 from Tham Namthip Bureau of Monks, Uthai Thani F, G Pupina peguensis: specimens F CUMZ 12050 from Chai Thong Wararam Temple, Nakhon Sawan and G CUMZ 12051 from Tham Saeng Wiset Bureau of Monks, Nakhon Sawan H Pupina siamensis, specimen CUMZ 12069 from Khao Chi Chan Buddha Image, Chonburi. All not to scale.

Figure 26. A Pupina bensoni sp. nov., paratype CUMZ 12046 / 1 from Khao Wong Cave, Uthai Thani B Pupina hungerfordiana, specimen NHMUK 91.3.14.686 - 7 from Hsaddan Koo C Pupina billeti, holotype MNHN-IM- 2000 - 35841 D Pupina verneaui, syntype MNHN-IM- 2000 - 35843 from Ha-Giang, Tonkin E, F Pupina peguensis E syntype of Pupina blanfordi NHMUK 1888.12.4.100 from Pegu and F specimen NHMUK ex. Cuming coll. from Lao Mountains, Camboja. Photo: P. Maestrati, MNHN (C, D).