Pupinella sonlaensis (Do, 2017) Jirapatrasilp & Sutcharit & Panha, 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

Pupinella sonlaensis (Do, 2017) comb. nov.

Figs 11H , 12F

Pupina sonlaensis Do, 2017: 300, 302, figs 2a, 3a. Type locality: limestone karst in Muong Bu Commune, Muong La District, Son La Province, Vietnam.

Type material examined.

Holotype HNUE-OC 00108 figured in Do (2017: figs 2a, 3a). Paratypes ZRC.MOL.9377 (3 shells; Figs 11H , 12F ) from the type locality.

Diagnosis.

Shell ovate-fusiform; last whorl ca. 60% of shell height. Apertural lip slightly expanded and reflected, thickened cord-like peristome absent; apertural lip when observed from lateral view almost straight. Parietal callus somewhat distinct and cord-like. Parietal tooth sharp with wide base, thickened and covering posterior canal. Anterior canal funnel-like, appearing as a slit on the inside, widened on outer margin, bordered by a thickened columellar margin. Umbilicus closed.

Differential diagnosis.

Pupinella sonlaensis is most similar to P. mansuyi in shell size, but differs in having an ovate-fusiform shell shape with a less thickened parietal tooth, as well as a less thickened, expanded, and reflected apertural lip without a thickened cord-like inner peristome.

Distribution.

Muong La District, Thuan Chau District, and Van Ho District, Son La Province, Vietnam ( Do 2017).

Remarks.

This taxon is allocated to the genus Pupinella due to the presence of a funnel-like anterior canal, which is the diagnostic character of this genus. The paratype figured in this study is similar to P. mansuyi in having a triangular parietal tooth covering the posterior canal and an expanded and reflected apertural lip with somewhat cord-like inner peristome, although with less thickening, and the shell has a less elongate shape. However, the holotype of P. sonlaensis figured in Do (2017: figs 2a, 3a) has an ovate-fusiform shell with a thickened, wide-based parietal tooth not covering the posterior canal, and a slightly expanded and reflected apertural lip without a thickened cord-like inner peristome. A thorough examination of the specimens would clarify whether the type series contain more than one taxon or whether the validity of this taxon should be reassessed.

Figures

Figure 11. Shells of Pupinella species from mainland Southeast Asia. A-G Pupinella mansuyi: A syntype of Eupupina mansuyi MNHN-IM- 2000 - 30756 from Deux-Ponts B syntype of Eupupina mansuyi MNHN-IM- 2000 - 36067 from Deux-Ponts C syntype of Eupupina mansuyi MNHN-IM- 2000 - 36068 from Quang-Huyen D syntype of Eupupina mansuyi RBINS MT 970 / 1 from Quang-Huyen E holotype of Pupinella frednaggsi NHMUK 20170285 F specimen CUMZ 12148 from Pha Chu Mount, Nan, and G specimen CUMZ 12149 from Pha Tub Cave, Nan H Pupinella sonlaensis, paratype ZRC. MOL. 9377 I-L Pupinella illustris I, J syntypes of Pupina illustris MNHN-IM- 2000 - 35842 from Tonkin K lectotype of Pupina tonkiniana MNHN-IM- 2000 - 35838 from Lang-Son et That-Khe, and L paralectotype of Pupina tonkiniana SMF 109932 / 10 from Tonkin: That-khe. Photo: A. Lardeur, P. Maestrati, MNHN (A-C, I-K), F. Trus, RBINS (D), S. K. Tan, ZRC (H).

Figure 12. A-C Pupinella mansuyi: A syntype of Eupupina mansuyi RBINS MT 970 / 1 from Quang-Huyen B specimen CUMZ 12148 from Pha Chu Mount, Nan, and C specimen CUMZ 12149 from Pha Tub Cave, Nan. D, E Pupinella illustris D syntype of Pupina illustris MNHN-IM- 2000 - 35842 from Tonkin and E paralectotype of Pupina tonkiniana SMF 109932 / 10 from Tonkin: That-khe F Pupinella sonlaensis, paratype ZRC. MOL. 9377. Photo: F. Trus, RBINS (A), P. Maestrati, MNHN (D), S. K. Tan, ZRC (F).