Annotated checklist of the operculated land snails from Thailand (Mollusca, Gastropoda, Caenogastropoda): the family Pupinidae, with descriptions of several new species and subspecies, and notes on classification of Pupina Vignard, 1829 and Pupinella Gray, 1850 from mainland Southeast Asia Author Jirapatrasilp, Parin https://orcid.org/0000-0002-5591-6724 Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand Author Sutcharit, Chirasak Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand jirasak4@yahoo.com Author Panha, Somsak Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand & Academy of Science, The Royal Society of Thailand, Bangkok 10300, Thailand somsak.pan@chula.ac.th text ZooKeys 2022 2022-08-25 1119 1 115 http://dx.doi.org/10.3897/zookeys.1119.85400 journal article http://dx.doi.org/10.3897/zookeys.1119.85400 1313-2970-1119-1 A3BE91C6B79344E1A886A803BF104D8B F158A7C5261D52B69288A62F3C777CAF Coptocheilus sectilabris (Gould, 1843) Fig. 5A-C Cyclostoma sectilabrum Gould, 1843: 140. Type locality: Tavoy [Dawei, Dawei Township, Dawei District, Tanintharyi Region, Myanmar]. Gould 1844 : 459, pl. 24, fig. 10. Pfeiffer 1848: pl. 24, figs 17, 18. Pfeiffer 1849: 164, 165. Johnson 1964 : 147. Megalomastoma sectilabre - Theobald 1858 [1857]: 247, Yanglaw, on the Tenasserim [Tanintharyi Region, Myanmar]. Megalomastoma sectilabrum -Sowerby I 1866: Pupinidae , pl. 1 (pl. 263), Pollicaria and Megalomastoma , sp. 19, fig. 24. Hanley and Theobald 1870 : 4, pl. 7, fig. 3. Reeve 1878 : Pupinidae , pl. 10, sp. 88. Crosse 1879 : 339. de Morgan 1885 : 412, 413. Megalomastoma (Coptocheilus) sectilabrum - Nevill 1878 : 297. Megalomastoma (Coptochilus) sectilabrum - von Martens 1886 : 161, King Island [Kadan Island or Kadan Kyun, Kyunsu Township, Myeik District, Tanintharyi Region, Myanmar]. von Moellendorff 1887 [1886]: 314, Tenasserim. Schistoloma sectilabrum - Kobelt 1902 : 280. Gude 1921 : 170, 171. Zilch 1957 : 42. Maassen 2001 : 43. Tumpeesuwan and Panha 2008 : 65, 66, fig. 1a-c, Kaeng Krachan National Park, Phetchaburi Province, Thailand. Egorov 2013 : 14, fig. 22d-g. BEDO 2017 : 97. Sutcharit et al. 2018 : 157, figs 5-11e, 5-13m. Pall-Gergely et al. 2019 : 325, 326. Type material examined. Lectotype MCZ 169361 (Fig. 5A ) from Tavoy. Paralectotype MCZ 87934 (1 shell) from Tavoy. Other material examined. SMF 109813 (1 shell; Fig. 5B ) from Tavoy. CUMZ OLM-0111 (1 shell; Fig. 5C ) from Kaeng Krachan District, Phetchaburi Province, 20 Sept. 1998 . Diagnosis. Shell elongate conical without any periumbilical keel. Aperture round with a slight angular indentation at upper junction of peristome. Differential diagnosis. Coptocheilus sectilabris is different from C. sumatranus in having a slight angular indentation at the upper junction of the peristome. Distribution. Myanmar and western Thailand ( Tumpeesuwan and Panha 2008 ). Remarks. As the original description did not explicitly state that the description of this species was based on a single specimen (nor could this be inferred), the designation of a holotype by Johnson (1964) in fact constitutes a lectotype designation ( ICZN 1999 : Art. 74.6). Several records of C. sectilabris from southern Thailand and peninsular Malaysia should be recognised as C. sumatranus (see below). The occurrence of C. sectilabris in Vietnam ( Thach 2016 ) is dubious and needs further confirmation ( Pall-Gergely et al. 2019 ).