Contributions on a small collection of the former Subulinidae Fischer & Crosse, 1877 (Eupulmonata, Achatinoidea) with catalogue of the Glessula and Rishetia species recorded from Myanmar Author Man, Nem Sian 0000-0002-4453-734X Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand & Department of Zoology, University of Yangon, University Avenue Road, Kamayut Township 11041, Yangon, Myanmar Author Ablett, Jonathan D. 0000-0002-7277-1934 Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW 7 5 BD, UK Author Lwin, Ngwe 0000-0002-4394-3741 Fauna and Flora International, No. 35, 3 rd Floor, Shan Gone Condo, Myay Ni Gone Market Street, Sanchaung Township, Yangon, Myanmar Author Sutcharit, Chirasak 0000-0001-7670-9540 Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand Author Panha, Somsak 0000-0002-4431-2458 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 text ZooKeys 2024 2024-07-30 1208 173 239 journal article 10.3897/zookeys.1208.116083 0215503D-E8B4-4179-89F6-FB2CCC59F37E Genus Rishetia Godwin-Austen, 1920 Glessula ( Rishetia ) Godwin-Austen, 1920: 7 . Rishetia — Schileyko 1999: 532 . Raheem et al. 2014: 138 , 139. Budha et al. 2017: 137 . Preece et al. 2022: 127 . Type species. Achatina tenuispira Benson, 1836 by original designation. Diagnosis. Shell slender and conical; spire high, turreted, and regularly attenuated; embryonic whorls smooth or with striations and subsequent whorls have thick or fine and equally or irregularly spaced radial ribs. Aperture oblique, narrow to broad, and ovate shape; columella concave and truncated; columellar margin not expanded. Penis large, thick, and moderately long; epiphallus relatively long; flagellum present with tubular shape; epiphallic caecum present; vagina enlarged, short ~ 1 / 2 of penis length. Remarks. Originally, Godwin-Austen (1920) proposed Rishetia as a subgenus of Glessula , which Schileyko (1999) raised to the generic level, followed by Raheem et al. (2014) , Budha et al. (2017) , and Preece et al. (2022) . Rishetia can be distinguished from Glessula by having a slender elongate-conical shell with a tubular-shaped flagellum and epiphallic caecum present, while Glessula processes an ovate-conical shell with a comb-like flagellum and epiphallic caecum absent (Tables 2 , 3 ). Rishetia can generally be differentiated from Bacillum by having a narrowly attenuated shell, convex and smaller apex, straight columella, and weak striations; Bacillum has a cylindrical shell, large and rounded apex, more concave columella, and stronger radial striations (Table 2 ). More information on the genitalia as well as a molecular phylogeny based on multiple species will clarify the systematic relationship of these two genera. This genus has been documented in India , Sri Lanka , Bangladesh , and Nepal , with its presence in Southeast Asia limited to Myanmar ( Godwin-Austen 1920 ; Schileyko 1999 ; Raheem et al. 2014 ; Budha et al. 2015 , 2017 ). Currently, 23 species are recognised; among these, eleven species and subspecies have been documented from Myanmar ( Godwin-Austen 1920 ; MolluscaBase 2023 ).