Pupina sonlaensis Do, 2017

Sang, Do Duc, 2017, Two new species of the genus Pupina (Caenogastropoda: Pupinidae) from Northwestern Vietnam, Raffles Bulletin of Zoology 65, pp. 299-303 : 300

publication ID	https://doi.org/ 10.5281/zenodo.5356529
publication LSID	lsid:zoobank.org:pub:E4293A48-2063-4688-A2D3-C4F3F655F3FD
persistent identifier	https://treatment.plazi.org/id/0A024E21-CE7E-FFC1-1EB2-FF53FD0EDA2F
treatment provided by	Valdenar
scientific name	Pupina sonlaensis Do
status	sp. nov.

Treatment

Pupina sonlaensis Do View in CoL , new species

( Figs. 1 View Fig , 2A View Fig , 3A View Fig ; Table 2)

Pupina sp.1 – Do et al., 2015: 126, fig. 6D.

Type specimens. Holotype: 1 ex. (SH 10.8 mm, SW 5.6 mm) ( HNUE-OC 00108 ), limestone karst in Muong Bu Commune , Muong La District, Son La Province, Vietnam (21°25′26″N, 104°01′34″E; at elevation 711 m), coll. Do Duc Sang & Nguyen Thanh Lap, 12 October 2013 GoogleMaps . Paratypes: 7 ex. ( SORC 1045 ) , 3 ex. ( HNUE-OC) , 3 ex. ( ZRC.MOL. 9377), same data as holotype GoogleMaps .

Non-type material examined. 7 ex. ( SORC 1046 ) , 3 ex. ( SORC 1046 ), limestone forests in Quynh Thuan Village, Bo Muoi Commune, Thuan Chau District , Son La Province (21°27′48″N, 103°49′26″E; elevation 631 m), coll. Do Duc Sang, 4 October 2014 GoogleMaps ; 8 ex. ( SORC 1047 ), limestone forests in Pa Cop Village, Van Ho Commune, Van Ho District , Son La Province (20°45′56″N, 104°44′33″E; elevation 1013 m), coll. Tran Thi Quynh & Do Duc Sang, 26 October 2013 GoogleMaps .

Etymology. The specific epithet “ sonlaensis ” is derived from its type locality Son La Province of Vietnam, with the Latin suffix “-ensis” added to form an adjective.

Diagnosis. Anterior canal funnel-like, appearing as a slit on the inside, widened on outer margin, bordered by a thickened collumellar margin. Parietal tooth well-developed, triangular. Umbilicus closed.

Description. Shell small (SH 10.23–10.80 mm), elongateovate, solid, glassy-white to brownish yellow, and devoid of prominent sculpture on the highly glazed smooth surface. Apex obtuse. Shell surface with rather regular, inconspicuous growth lines. Microscopic radial ridges about two times denser on last whorl than on penultimate whorl. Whorls 6–6½, early whorls slightly convex, last whorl large, about two-thirds of shell height, and relatively convex in front. Spire somewhat extended and strongly convex. Sutures moderately impressed, but shallow. Aperture circular; outer lip thickened and moderately flaring. Parietal callus sharply defined and thickened with whitish or pale yellow tint. Peristome simple, thickened, somewhat reflexed, and interrupted by two canals. Posterior canal continues vertically upward and forming narrow groove, which is bordered by thickened lip and parietal tooth. Anterior canal funnel-like, appearing as a slit on the inside and widening towards the outer margin, with thickened collumellar margin overhanging in the inner margin. Parietal tooth triangular, well-developed, and obliquely positioned. Umbilicus closed.

Distribution. The new species is known from several limestone karsts in Muong La District, Thuan Chau District and Van Ho District, Son La Province, Northwestern Vietnam.

Remarks. The new species is somewhat similar to P. tonkiana Bavay & Dautzenberg, 1899 ( Figs. 2C View Fig , 3C View Fig , from Lang Son Province, Vietnam), but the latter is more slender and more tapering in shape. The anterior canal of P. tonkiana is a simple open groove, but is thickened and overhanging at the leading edges in P. sonlaensis n. sp. Moreover, P. tonkiana has a short, small and thin parietal tooth, while the parietal tooth of P. sonlaensis n. sp. is distinctly larger and forms a distinct narrow posterior canal. P. sonlaensis n. sp. shows little intraspecific conchological variation, except shell size ( Table 2). The operculum is unknown.