Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae) Author Páll-Gergely, Barna 31E196E9-5A51-4295-9A36-D5DA689502B7 Centre for Agricultural Research, Hungarian Academy of Sciences (MTA), Herman Ottó Street 15, Budapest, H- 1022, Hungary. pall-gergely.barna@agrar.mta.hu text European Journal of Taxonomy 2018 2018-08-16 455 1 114 journal article 22297 10.5852/ejt.2018.455 44a2fcf6-cc1b-4c07-9554-dd6dd279a76d 3817707 C445E95B-446A-4601-AAA3-C1CCBAB627F9 Genus Plectopylis Benson, 1860 Plectopylis Benson, 1860: 244 . Type species Helix achatina Pfeiffer, 1845 by subsequent designation (Pilsbry 1894). Helix achatina Pfeiffer, 1845 is a junior homonym of Helix achatina Gmelin, 1791 . The valid name of the species is Plectopylis bensoni Gude, 1914 . Species included Plectopylis anguina ( Gould, 1847 ) , P. bensoni Gude, 1914 , P. cairnsi Gude, 1898 , P. crassilabris sp. nov. , P. cyclaspis Benson, 1859 , P. karenorum W. Blanford, 1865 , P. linterae Möllendorff, 1897 , P. malayana sp. nov. and P. thompsoni sp. nov. Diagnosis Shell sinistral, flat, widely umbilicated, usually thick; protoconch smooth (matt) or with small tubercles, usually with irregular, low growth ridges (wrinkles); apertural fold present; parietal wall with two vertical lamellae, which are fused at their upper ends forming a structure resembling the Greek letter lambda (λ); palatal side with a vertical plate formed by the accretion of two plicae (the fourth and the fifth), and three horizontal plicae above and one below that plate. Inner wall of penis sculptured with multiple, usually serrate parallel folds, and sometimes calcareous crystals; penial caecum usually absent, or a vestigial caecum might be discernible; retractor muscle inserts on penis-epiphallus transition (or on caecum); attached to penis with weak muscle fibres, it is shorter than penis, internally with a few parallel folds; vas deferens slender, usually thickened near its proximal end; vagina mostly short; bursa copulatrix with a slender stalk and a bursa of variable length; diverticulum short and thick, ovoid. Differential diagnosis See differential diagnosis and remarks under Chersaecia . Distribution Southern Myanmar , northern Malaysia and north-eastern India . Remarks Table 3 summarizes the key characters of species of Plectopylis .