Indoartemon tridens ( Moellendorff , 1898)

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 : 40

Taxon classification Animalia Pulmonata Streptaxidae

Indoartemon tridens ( Moellendorff, 1898) Figs 1, 6C

Streptaxis tridens Möllendorff 1898: 67. Type locality: Boloven, Laos [=Boloven Plateau, Paksong, Champasak, Laos]. Gude 1903: 220.

Odontartemon tridens - Kobelt 1905: 94, 95, pl. 58, figs 19, 20.

Indoartemon tridens - Zilch 1961: 85, pl. 5, fig. 15. Richardson 1988: 225. Schileyko 2011: 23.

Material examined.

Holotype SMF 108507 (Fig. 6C).

Remarks.

Shell oblique-ovate with 5½ whorls, semi-transparent, spire slightly convex, with distinct sutures. Shell surface glossy white with thin growth lines; following whorls regularly coiled. Last whorl axially deflected. Aperture triangular; peristome continuous; lip thickened, little expanded and slightly reflected. Apertural dentition with one large parietal lamella, one palatal lamella, and one small bifid columellar lamella.

Only the type specimen was examined. Indoartemon tridens differs from Indoartemon eburneus , Indoartemon prestoni (Gude, 1903) and Indoartemon medius Siriboon & Panha, 2014 from Thailand by having a bifid columellar lamella, an ovate-heliciform shape, its smooth shell surface, narrow umbilicus, and having the left side of penultimate whorl extended beyond the diameter of last whorl. For comparison, Indoartemon eburneus and Indoartemon prestoni have a less deviated last whorl, transverse ridges on the shell, and a widely open umbilicus; Indoartemon medius has an angular penultimate whorl and strong transverse ridges.