Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species Author Inkhavilay, Khamla 2E620B9C-48BA-48E6-A017-FE8ED2AB0E59 Email: kinkhavilay @ gmail. com & urn: lsid: zoobank. org: author: 2 E 620 B 9 C- 48 BA- 48 E 6 - A 017 - FE 8 ED 2 AB 0 E 59 kinkhavilay@gmail.com Author Sutcharit, Chirasak C2E2FA6B-A3F9-4F33-B447-B59B1BD322D4 urn: lsid: zoobank. org: author: C 2 E 2 FA 6 B-A 3 F 9 - 4 F 33 - B 447 - B 59 B 1 BD 322 D 4 & Corresponding authors: jirasak 4 @ yahoo. com; somsak. pan @ chula. ac. th jirasak4@yahoo.com Author Panha, Somsak AC935098-D901-4F35-A414-4B0D4FE44E79 urn: lsid: zoobank. org: author: AC 935098 - D 901 - 4 F 35 - A 414 - 4 B 0 D 4 FE 44 E 79 & Corresponding authors: jirasak 4 @ yahoo. com; somsak. pan @ chula. ac. th jirasak4@yahoo.com text European Journal of Taxonomy 2017 2017-06-13 330 1 40 journal article 22089 10.5852/ejt.2017.330 14d5ad89-9e69-45f8-bc61-e14ca9deafbd 2118-9773 3829744 FDFA7FAC-FC92-404B-9058-A426DAB6C693 Amphidromus ( Amphidromus ) laosianus Bavay, 1898 Figs 1 , 4G Amphidromus laosianus Bavay, 1898: 15 , 16, pl. 2, fig. 1, 1a. Type locality: Khône, sur les bords du Mékong [on the banks of the Mekong River, Khone, Champasak , Laos ]. Amphidromus laosianus var. albocaerulescens Bavay, 1898: 16 , pl. 2, fig. 2, 2a. Type locality: Khône, sur les bords du Mékong [on the banks of the Mekong River, Khone, Champasak , Laos ]. Amphidromus laosianus – Pilsbry 1900: 183 , 184, pl. 62, figs 60–61. — Laidlaw & Solem 1961: 526 , 634. Amphidromus laosianus var. albocaerulescens – Pilsbry 1900: 184 , pl. 62, figs 62–63. — Laidlaw & Solem 1961: 526 , 598. Material examined LAOS : 1D + 1S shells ( Fig. 4G ), Khone District, Champasak , South Laos ( RMNH 101049 ); 1D + 2S shells, W.J.M. Maassen collection; 2D + 2D juveniles, Khone, South Laos, ZMB, Lehmann collection. Remarks Currently known only from the type locality. The unique shell characters are chirally dimorphic, conical to elongate conical; whorls weakly convex, with white subsutural band. Shell color with yellowishbrown or brownish radial streaks on pinkish to whitish ground color; dark varix present. Aperture elongated; peristome thickened, expanded and reflected; lip folded and pinkish. Parietal callus pinkish and thickened; columella pinkish and straight; umbilicus imperforated. Laidlaw & Solem (1961) mentioned that this species is similar to the A. atricallosus leucoxanthus variety “ laidlawi ” ( Solem 1965 : pl. 1, fig. 3; Sutcharit & Panha 2006 : fig. 4d–e). However, it differs in having a slender shell and pinkish peristome, parietal callus and inside of the aperture, while “ var. laidlawi ” has a white lip, parietal callus and inside aperture, and more depressed suture. Furthermore, A. cambojiensis (Reeve, 1860) can be distinguished from this species by having a very large and thickened shell, thickened and white parietal callus and lip, and purplish inside aperture (see Sutcharit et al . 2015 ).