Chuatienpupa, Sang & Son, 2023

Sang, Do Duc & Son, Nguyen Thanh, 2023, A new genus and new species of Pupinidae (Gastropoda: Caenogastropoda) from Northern Vietnam, Ruthenica, Russian Malacological Journal 33 (1), pp. 19-26 : 20-21

Chuatienpupa gen. nov.

Type species – Chuatienpupa megacanalis sp. nov.

ZooBank registration: urn:lsid:zoobank.org:act:56A18573-7865-4EA3-9731-279EADD65F57

Diagnosis. As in the type species.

Differential diagnosis. Chuatienpupa gen. nov. is most similar to the genus Pupina Vignard, 1829 in general shell and aperture shape, with the presence of canals (anterior and posterior canals). However, this closely related genus lacks the basal plica, and upper palatal plica (some Pupina species possesses a homologous structure to the lower palatal plica of the new genus), which divides the posterior canal into two cavities in the new genus. In addition, the anterior canal of Pupina is narrower and situated on the columellar side. Finally, Pupina possesses a circular, thin operculum, outer surface flat and con- sists of many spirals, while Chuatienpupa gen. nov. has a solid, closed bowl-shaped operculum, with flat inner, and completely smooth, dome-shaped outer surface ( Fig. 1).

Pupinella Gray, 1850 s.l., is somewhat similar to the new genus due to the pupoid shell shape, and the presence of the anterior canal, but the posterior canal of that genus is absent. Species of the subge- nus Pupinella (Pupinopsis) H. Adams, 1866 (type species: Pupinella swinhoei H. Adams, 1866 ) have both canals (anterior and posterior), but differs from the new genus by having a narrower anterior canal, which is situated on the columellar side and lacking both palatal plica and basal plica, a circular, thin operculum, with outer surface flat and consisting of 4 to 5 spirals.

Barnaia Thach, 2017 , Pollicaria Gould, 1856 and Rhaphaulus Pfeiffer, 1856 are similar to Chuatienpupa gen. nov. in the pupoid shell shape, but differ in the absence of canals, as well as the lack of parietal plica, and a flat, circular operculum ( Figs 1, 3–4 ). The shell of Pseudopomatias Möllendorff, 1885 and Vargapupa Páll-Gergely, 2015 differs from that of Chuatienpupa gen. nov. by the spindle shaped with rather regularly ribbed on shell surface, the peristome consists of two circles (most of species), but lacks anterior and posterior canals, the operculum densely coiled, thin and membranous. Both Coptocheilus Gould, 1862 and Tortulosa Gray, 1847 lack the canals on the peristome, which is present in Chuatienpupa gen. nov.

Etymology. The name Chuatienpupa gen. nov. is the combination of the type locality, where the type species was found (Chua Tien pagoda, Lac Thuy district, Hoa Binh province, Vietnam) and Pupa (generic name that used to be used for pupoid shaped Pupinidae ).

Remarks. Chuatienpupa gen. nov. is classified in the family Pupinidae due to the smooth sculpture, pupoid shaped and covered by a glaze shell, the presence of two canals at the parieto-angular corner and the basal area.

Figures

FIG. 3. Chuatienpupa megacanalis sp. nov.A–E. Holotype VNMN-IZ 000.002.331.F–H. Paratypes ZVNU.MOL 047.Photos: Nguyen T.S. and Do D.S.

FIG. 4.A. Pupina keraudrenii Vignard, 1829 (NMR 178592). B. Pupina anceyi Bavay et Dautzenberg, 1899 (syntype MNHN- IM-2000-35833). C. Pupinella illustris (Mabille, 1887) (lectotype of Pupina tonkiniana Bavay & Dautzenberg, 1899, MNHN-IM-2000-35838). D. Pupinella mansuyi (Dautzenberg et Fischer, 1908) (syntype RBINS MT970). E. Barnaia longituba (Páll-Gergely et Gargominy, 2017) (holotype MNHN 2012-27162). F. Rhaphaulus tonkinensis Páll-Gergely, Hunyadi et Maassen, 2014 (holotype HNHM 98757, from Páll-Gergely et al., 2014).