Plectopylis Benson, 1860

Páll-Gergely, Barna, 2018, Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae), European Journal of Taxonomy 455, pp. 1-114 : 75

publication ID	https://doi.org/10.5852/ejt.2018.455
publication LSID	lsid:zoobank.org:pub:C445E95B-446A-4601-AAA3-C1CCBAB627F9
DOI	https://doi.org/10.5281/zenodo.3818818
persistent identifier	https://treatment.plazi.org/id/03CC87A0-6C66-8A6D-FDA3-FD5444A7F842
treatment provided by	Valdenar (2020-05-08 18:45:36, last updated 2025-02-20 12:21:53)
scientific name	Plectopylis Benson, 1860
status

Treatment

Genus Plectopylis Benson, 1860 View in CoL

Plectopylis Benson, 1860: 244 View in CoL .

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 View in CoL .

Species included

Plectopylis anguina ( Gould, 1847) View in CoL , P. bensoni Gude, 1914 View in CoL , P. cairnsi Gude, 1898 View in CoL , P. crassilabris View in CoL sp. nov., P. cyclaspis Benson, 1859 View in CoL , P. karenorum W. Blanford, 1865 View in CoL , P. linterae Möllendorff, 1897 View in CoL , P. malayana View in CoL sp. nov. and P. thompsoni View in CoL 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 .

References

Benson W. H. 1860. Notes on Plectopylis, a group a Helicidae distinguished by several internal plicate Ephiphragms; with the Characters of a new Species. The Annals and Magazine of Natural History 3 (5): 243 - 247. Available from https: // biodiversitylibrary. org / page / 18658580 [accessed 30 Jul. 2018].

Blanford W. T. 1865. Contributions to Indian Malacology, No. V. Descriptions of new land shells from Arakan, Pegu, and Ava; with notes on the distribution of described species. Journal of the Asiatic Society of Bengal 34 (2): 66 - 105. Available from https: // biodiversitylibrary. org / page / 37191013 [accessed 30 Jul. 2018].

Gmelin J. F. 1791. Caroli a Linne, systema naturae. Tom. I. Pars VI.: 3021 - 3910. Beer, Leipzig. Available from https: // biodiversitylibrary. org / page / 25743606 [accessed 30 Jul. 2018].

Gould A. A. 1847. [Dr. Gould described new shells, received from Rev. Mr. Mason, of Burmah, several of which had been furnished …]. Proceedings of the Boston Society of Natural History 2: 218 - 221. Available from https: // biodiversitylibrary. org / page / 9490902 [accessed 30 Jul. 2018].

Mollendorff O. von 1897. Drei neue Arten. Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft 29: 28 - 31. Available from https: // biodiversitylibrary. org / page / 28228258 [accessed 30 Jul. 2018].

Pfeiffer L. 1845. Uebersicht der mit inneren Lamellen versehenen Helix-Arten. Zeitschrift fut Malakozoologie 2: 81 - 87. Available from https: // biodiversitylibrary. org / page / 16291669 [accessed 30 Jul. 2018].