Macrochlamys Gray, 1847

Pholyotha, Arthit, Sutcharit, Chirasak & Panha, Somsak, 2018, The land snail genus Macrochlamys Gray, 1847 from Thailand, with descriptions of five new species (Pulmonata: Ariophantidae), Raffles Bulletin of Zoology 66, pp. 763-781 : 764-765

Genus Macrochlamys Gray, 1847

Macrochlamys Gray, 1847: 169 – Benson, 1832: 13, 76 [unavailable]; Benson, 1836: 350, 351 [unavailable]; Stoliczka, 1871: 246; Godwin-Austen, 1883: 76–84; Blanford & Godwin-Austen, 1908: 77–79; Zilch, 1959: 323; Thiele, 1931: 628; Schileyko, 2003: 1322.

Tanychlamys Benson, 1834: 89 [unavailable] – Stoliczka, 1871: 247.

Orobia Albers, 1860: 57 .

Type species. Helix vitrinoides Deshayes, 1831 , by monotypy.

Diagnostic description. Shell small to large, dextral, depressed to semi-globose, thin, translucent, surface smooth and shiny, with 4–6 whorls. Last whorl rounded to slightly shouldered. Aperture lunate and normally with simple lip. Columellar margin slightly reflected near umbilicus. Umbilicus open or minutely open.

Genitalia with spirally coiled epiphallic caecum to which retractor muscle is attached. Flagellum, gametolytic organ, dart apparatus with retractor muscle and penial verge well developed. Animal with well-developed mantle edge with two shell-lobes and three dorsal-lobes ( Fig. 1 ). Body colour variable, from black or grey to colourful orange or yellow ( Fig. 2 ). Sole tripartite, caudal foss and caudal horn present.

Radula with symmetric tricuspid central tooth, asymmetric tricuspid lateral teeth and bicuspid marginal teeth.

Figures

Fig. 1. Schematic drawing of the external features and mantle terminology of Macrochlamys. Abbreviations: ant-ldl, anterior left dorsal lobe; cf, caudal foss; ch, caudal horn; lsl, left shell lobe; post-ldl, posterior left dorsal lobe; rdl, right dorsal lobe; rsl, right shell lobe.

Fig. 2. Living snails of Macrochlamys spp. from Thailand. A, Macrochlamys aurantia new species, paratype (CUMZ 7103), Thong Pha Phum, Kanchanaburi, shell width about 15 mm; B, M. coleus new species, paratype (CUMZ 7106), Sai Yok, Kanchanaburi, shell width about 15 mm; C,M. caverna new species, paratype (CUMZ 7109), Tha Wung, Lopburi, shell width about 17 mm; D, M. lemma new species, paratype (CUMZ 7116), Ban Mi, Lopburi, shell width about 15 mm; E, M. tanymentula new species, paratype (CUMZ 7119), Thong Pha Phum, Kanchanaburi, shell width about 10 mm; F, M. kelantanensis (CUMZ 7125), Lam Kaen, Phang-Nga, shell width about 20 mm.