Pupina bilabiata 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 bilabiata Jirapatrasilp sp. nov.

Figs 28M-P , 31D-F , 32B-D , 33A

Type material examined.

Holotype CUMZ 12073/1 (Figs 28M , 31D ), 31 July 2019, coll. C. Sutcharit, A. Pholyotha. Measurement: shell height 7.4 mm, shell width 5.0 mm and 5½ whorls. Paratypes CUMZ 12073/2-13 (12 specimens in ethanol; Fig. 32B ) and NHMUK 20210334 (2 shells), same data as holotype.

Type locality.

Banpot Pisai Temple, Lang Suan District, Chumphon Province, Thailand, 9°56'05.0"N, 99°08'56.7"E, 20 m amsl.

Other material examined.

CUMZ 12074 (11 shells) from Bat Cave , Phu Pha Man District, Khon Kaen Province, 20 Oct. 2007 . CUMZ 12075 (9 shells and 7 specimens in ethanol) from Phraya Nakharaj Cave , Phu Pha Man District, Khon Kaen Province, 21 July 2020 . CUMZ 12076 (4 shells) from Tham Pha Pu Temple, Mueang Loei District , Loei Province, 28 Oct. 2018 . CUMZ 12077 (1 shell and 17 specimens in ethanol) from Tham Pha Pu Temple , Mueang Loei District, Loei Province, 1 Sept. 2020 . CUMZ 12078 (3 shells) from Phu Pha Lom, Mueang Loei District , Loei Province, 1 Sept. 2020 . CUMZ 12079 (2 shells; Figs 28N, 31E) from Tham Pha Ya Temple, Na Duang District , Loei Province, 28 Oct. 2018 . CUMZ 12080 (2 specimens in ethanol) from Hin Pha Ngam Park, Nong Hin District , Loei Province, 2 Sept. 2020 . CUMZ 12081 (13 shells; Figs 28O , 31F ) from Pha Jor Cave , Na Wang District, Nong Bua Lam Phu Province, 15 Oct. 2007 . CUMZ 12082 (15 shells and 9 specimens in ethanol; Fig. 32C ) from Pha Jor Cave , Na Wang District, Nong Bua Lam Phu Province, 31 Aug. 2020 . CUMZ 12083 (2 shells) from Tham Suwannakhuha Temple, Suwannakhuha District , Nong Bua Lam Phu Province, 31 Aug. 2020 . CUMZ 12084 (8 shells) from Pa Pha Ya Temple, Suwannakhuha District , Nong Bua Lam Phu Province, 31 Aug. 2020 . CUMZ 12085 (2 specimens in ethanol) from Phu Thong Thep Nimit Temple, Nong Saeng District , Udon Thani Province, 30 Aug. 2020 . CUMZ 12086 (2 shells; Figs 28P , 33A ) from Na San Temple, Ban Na San District , Surat Thani Province, 3 July 2017 . CUMZ 12087 (2 specimens in ethanol; Fig. 32D ) from Ban Yai , Phanom District, Surat Thani Province, 7 Aug. 2016 . CUMZ 12088 (2 shells) from Tham Nam Lod Thepnimit Bureau of Monks , Sawi District, Chumphon Province, 30 July 2019 . CUMZ 12089 (1 specimen in ethanol) from Tham Kanlayanamit Temple, Tham Phannara District , Nakhon Si Thammarat Province, 4 July 2017 .

Diagnosis.

Shell ovate-fusiform to fusiform; last whorl ca. three quarters of shell height. Apertural lip highly thickened, slightly expanded; with a furrow between inner and outer peristomes; inner peristome thickened, cord-like; apertural lip curved when observed from lateral view. Columellar tooth curved downward like an earlobe.

Differential diagnosis.

Pupina bilabiata sp. nov. is similar to P. peguensis in shell shape, but differs in having a furrow between inner and outer peristomes, with an inner peristome thickened and cord-like. This furrow also appears in P. godwinausteni sp. nov. and P. stoliczkai sp. nov., but P. godwinausteni sp. nov. is larger and more globose, and the apertural lip when observed from lateral view is more angled than that of P. bilabiata sp. nov., whereas P. stoliczkai sp. nov. belongs to the P. aureola species group.

Description.

Shell height 4.0-8.4 mm; shell width 4.4-5.7 mm. Shell ovate-fusiform to fusiform, solid, semi-transparent, whitish to pale brown, devoid of prominent sculpture on glazed smooth surface. Apex obtuse. Growth lines on shell surface inconspicuous. Whorls 5½ -6, last whorl large (ca. three quarters of shell height) and bulging slightly. Spire angle ca. 80°, somewhat extended. Sutures slightly impressed, but shallow. Aperture circular; lip thickened to highly thickened (ca. 0.5-0.6 mm wide and 0.3-0.6 mm thick) with paler colour, slightly expanded; apertural lip curved when observed from lateral view. 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. 0.8-0.9 mm long, 0.5 mm at its widest, curved outward and bulging at outer margin; anterior canal slit-like, as long as apertural lip width. Parietal tooth indistinct to thick; columellar tooth curved downward like an earlobe (ca. 1.5 mm long, 0.9 mm wide and 0.5 mm thick), covering anterior canal. Umbilicus closed. Operculum round, yellowish, transparent corneous with uneven edge.

Etymology.

The Latin specific epithet Pupina bilabiata means "with double lip" representing the separation of the inner and outer peristomes by a furrow.

Distribution.

Northeastern and southern Thailand.

Remarks.

This new species has a disjunct distribution and shows varying degrees of thickness of the inner peristome within specimens from the same collecting localities.

Figures

Figure 28. Shells of Pupina arula species group from mainland Southeast Asia A-G Pupina peguensis A syntype of Pupina blanfordi NHMUK 1888.12.4.100 and specimens B CUMZ 12105 C CUMZ 12050 D CUMZ 12103 E NHMUK ex. Cuming coll. F CUMZ 12094, and G CUMZ 12108 H-J Pupina crosseana H lectotype MNHN-IM- 2000 - 35834 I paralectotype RBINS MT 966 / 10591, and J specimen CUMZ 12049 K, L Pupina siamensis K lectotype SMF 109948 and L specimen CUMZ 12052 M-P Pupina bilabiata sp. nov. M holotype CUMZ 12073 / 1 and specimens N CUMZ 12079 O CUMZ 12081, and P CUMZ 12086 Q, R Pupina godwinausteni sp. nov. Q holotype CUMZ 12090 / 1 and R paratype CUMZ 12090 / 2. Photo: P. Maestrati, MNHN (H), F. Trus, RBINS (I).

Figure 31. A Pupina crosseana, specimen CUMZ 12049 from Khao Jedee Temple, Nakhon Sawan B, C Pupina siamensis: B lectotype SMF 109948 and C specimen CUMZ 12052 from Sri Thong Cave, Sra Keo D-F Pupina bilabiata sp. nov. D holotype CUMZ 12073 / 1, and specimens E CUMZ 12079 from Tham Pha Ya Temple, Loei and F CUMZ 12081 from Pha Jor Cave, Nong Bua Lam Phu.

Figure 32. Live specimens of A Pupina siamensis, specimen CUMZ 12071 from Tham Khao Loi Temple, Rayong B-D Pupina bilabiata sp. nov. B paratype CUMZ 12073 / 2 from Banpot Pisai Temple, Chumphon and specimens C CUMZ 12082 from Pha Jor Cave, Nong Bua Lam Phu and D CUMZ 12087 from Ban Yai, Surat Thani E, F Pupina godwinausteni sp. nov.: paratypes E CUMZ 12090 / 26 and F CUMZ 12091 from Khao Wong Cave, Uthai Thani G, H Pupina aureola: specimens G CUMZ 12117 from Lod Cave, Nakhon Sri Thammarat and H CUMZ 12121 from Tham Thong Panara Temple, Nakhon Sri Thammarat, showing its microhabitat in rotten log. All not to scale.

Figure 33. A Pupina bilabiata sp. nov., specimen CUMZ 12086 from Na San Temple, Surat Thani B, C Pupina godwinausteni sp. nov. B holotype CUMZ 12090 / 1 and C paratype CUMZ 12090 / 2 from Khao Wong Cave, Uthai Thani D Pupina arula, syntype UMZC I. 103025 " Ind " E Pupina mouhoti, possible syntype NHMUK ex. Cuming coll. from Camboja F Pupina vescoi, syntype NHMUK 1893.2.4.767 from Cochin China. Photo: J. Ablett, H. Taylor, NHM (D).