The land snail genus Macrochlamys Gray, 1847 from Thailand, with descriptions of five new species (Pulmonata: Ariophantidae) Author Pholyotha, Arthit Author Sutcharit, Chirasak Author Panha, Somsak text Raffles Bulletin of Zoology 2018 2018-12-03 66 763 781 journal article 10.5281/zenodo.5460634 2345-7600 5460634 1E7214C5-24E8-4860-BF13-203FD93A2C19 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. 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. 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.