Haploptychius fischeri (Morlet, 1887)

Inkhavilay, Khamla, Siriboon, Thanit, Sutcharit, Chirasak, Rowson, Ben & Panha, Somsak, 2016, The first revision of the carnivorous land snail family Streptaxidae in Laos, with description of three new species (Pulmonata, Stylommatophora, Streptaxidae), ZooKeys 589, pp. 23-53 : 32

Taxon classification Animalia Pulmonata Streptaxidae

Haploptychius fischeri (Morlet, 1887) Fig. 3G

Streptaxis fischeri Morlet 1887 [1886]: 259, 274, pl. 12, fig. 1, 1a. Type locality: Baie ďHalong et Montagne de ľÉléphant [Elephant Mountain of Halong Bay, Quang Ninh Province, Vietnam]. Gude 1903: 212.

Haploptychius fischeri - Kobelt 1906: 136, pl. 61, fig. 21, Richardson 1988: 215. Schileyko 2011: 25.

Material examined.

The species was described based on material from Jourdy’s collection and an illustration was included in the original description (Morlet 1887: 259, pl. 12, fig. 1, 1a). There is a single specimen from L. Morlet in the MNHN collections with an original label stating “Type”. In order to stabilize the name, a shell that matched well with the illustration and measurements given in the original description is designated here as lectotype MNHN-IM 200030873 (Fig. 3G).

Remark.

Haploptychius fischeri is currently known only from the north of Vietnam ( Schileyko 2011, Do and Do 2015). The type specimen was examined. Shell thickened, oblique-heliciform with depressed spire. Shell surface with strong radial ridges; penultimate whorl rounded; last whorl axially deflected. Aperture subquadrangular, parietal lamella strong and parietal callus thickened. Peristome wide; lip thickened and reflected. Umbilicus narrowly open.

Compared with Haploptychius pellucens and Haploptychius porrectus , this species differs in its larger and thicker shell, depressed spire, prominent transverse ridges, subquadrangular aperture, thicker parietal lamella, and narrower umbilicus.