Entadella athrix ( Möllendorff, 1901 )

Páll-Gergely, Barna & Hunyadi, András, 2019, Two new species of Entadella Páll-Gergely & Hunyadi in Páll-Gergely et al., 2016 from Vietnam (Gastropoda: Heterobranchia: Camaenidae), Raffles Bulletin of Zoology 67, pp. 694-700 : 696

Entadella athrix ( Möllendorff, 1901)

( Fig. 1A, B )

Chloritis athrix Möllendorff, 1901: 73–74 .

Chloritis (Trichochloritis) athrix — Zilch, 1966: 300, pl. 9, fig. 22. Entadella athrix — Páll-Gergely et al., 2016: 171.

Remarks. In our previous paper about this genus (Páll- Gergely et al., 2016) we had no possibility to publish photographs of the type specimens. Here we include photos of the lectotype ( Tonkin, Mansongebirge, coll. Möllendorff ex coll. Fruhstorfer, SMF 8528, fig. 1A).

The type locality of this species is “Mansongebirge” (Mount M ẫu SƠn) which is situated in Lạng SƠn Province, near the Chinese border in the eastern part of northern Vietnam. This site lies far from all other known localities in the northernmost region of the country ( Páll-Gergely et al., 2016; Fig. 2 ). The type specimens from Mẫu SƠn and the ones from the northern border region agree in size, shape, and colour. However, the latter ones lack the dense spiral lines on the ventral side that are characteristic of the typical specimens. We provisionally classify them as a single species until ethanol-preserved specimens become available .

Figures

Fig. 1. Shells of Entadella Páll-Gergely & Hunyadi in Páll-Gergely et al., 2016, species. A, B, lectotype of Entadella athrix (Möllendorff, 1901) (SMF 8528); B, sculpture of the ventral side, not to scale; C–F, holotype of Entadella kilchomani Páll-Gergely, new species (NHMUK 20190591); D, protoconch; E, dorsal surface; F, ventral surface. Scale “a” represents 3 mm and refers to figs. D, E, and F; scale “b” represents 30 mm and refers to figs. A and C. Note that the close-up pictures were taken using different illumination; original colours are closer to the ones on the entire shell.

Fig. 2. Distribution of Entadella Páll-Gergely & Hunyadi in Páll-Gergely et al., 2016 species. Empty triangle: E. athrix (Möllendorff, 1901); empty triangle with a “t”: type locality of E. athrix; filled circle: Entadella entadiformis Páll-Gergely & Hunyadi in Páll-Gergely et al., 2016; filled triangle: E. concava, new species; empty circle: Entadella kilchomani Páll-Gergely, new species.