Plectopylis karenorum (W. Blanford, 1865 )

Páll-Gergely, Barna, 2018, Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae), European Journal of Taxonomy 455, pp. 1-114 : 94-95

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.3818774
persistent identifier	https://treatment.plazi.org/id/03CC87A0-6C71-8A79-FDEF-FAEC44AEF9DF
treatment provided by	Valdenar (2020-05-08 18:45:36, last updated 2025-02-20 12:52:31)
scientific name	Plectopylis karenorum (W. Blanford, 1865 )
status

Treatment

Plectopylis karenorum (W. Blanford, 1865) View in CoL

Figs 35J View Fig , 41E View Fig

Helix (Plectopylis) karenorum Blanford, 1865: 73–75 , 94. [“Banks of Tsanda Khyoung, near Kaintha village, in Henzada district, Pegu ”, “on the banks of the Nungatho Khyoung, Henzada district”].

Helix karenorum – Pfeiffer 1868: 397; 1869: 503, pl. 108, figs 16–18.

Helix (Plectopylis) karenorum – Hanley & Theobald 1870: 7, pl. 13, fig. 6. — Godwin-Austen 1875b: 613, pl. 74, fig. 5a. — Nevill 1878: 72. — Tryon 1887: 164, pl. 35, figs 96–100.

Plectopylis karenorum View in CoL – Gude 1897b: 244–245, fig. 35a–d.

Plectopylis (Plectopylis) karenorum View in CoL – Gude 1899d: 148; 1899e: 175; 1914b: 132–134, fig. 66a–d.

Diagnosis

A small to medium-sized, fragile species having lighter and darker stripes on the dorsal side; the angled body whorl and concomitantly entirely flat dorsal surface is characteristic for this species.

Type material

No specimens of Plectopylis karenorum were found in the type collection of the NHM. However, I found samples collected by Blanford and labelled as being collected from one of the type localities. Therefore, the samples detailed below probably represent syntypes.

Material examined

Syntypes MYANMAR: 2 shells, Pegu, Nungathokhyoung, Henzadah, coll. Blanford ( NHMUK 1906.2.2.263); 5 shells, Pegu, Henzadah, coll. Blanford ( NHMUK 1906.2.2.146).

Additional material

MYANMAR: 1 shell, Pegu, coll. Möllendorff ( SMF 150097); 7 shells, Herizadah ( NHMUK); 1 shell, Burmah, Pegu, coll. A. S. Kennard ( NHMUK); 1 shell, Moulmain?, coll. Godwin-Austen ( NHMUK 1903.7.1.735); 3 shells, Burma, Pegu, ex coll. Museum Cuming ( NHMUK); 3 shells, Burmah, coll. Godwin-Austen ( NHMUK 1903.7.1.737); 3 shells, Henzada District ( NHMUK 1888.12.04.1548– 1550); 1 shell, Pegu, ex coll. H. Adams ( NHMUK 1878.1.28.283) .

LOCALITY UNKNOWN: 2 juv. shells, no data, coll. H.F./W.T. Blanford, acc. 1944 ( NHMUK).

Description

SHELL. Sinistral, completely flat, unusually thin-walled for Plectopylis ; colour basically greyish with brownish-corneous stripes; protoconch consists of 2.75–3 whorls, extremely finely tuberculated and roughly, irregularly wrinkled; whorls 5.5–6, separated by relatively shallow suture; whorls strongly angled, which results in an entirely flat dorsal surface; whole shell with fine reticulated sculpture; dorsal side and area inside umbilicus dominated by spiral lines (or spiral and radial lines are of comparable strength); periphery of body whorl dominated by radial wrinkles; aperture small, rather rounded, peristome slightly thickened and reflected; parietal callus strongly developed but blunt, slightly S-shaped, upper part of ‘S’ shorter; apertural fold in contact with parietal callus.

Three opened shells were examined. Lambda-complex complete; left leg with a posteriorly elongated end; upper branch approximately as long as elongated part of left leg; right leg with anteriorly and somewhat obliquely elongated end; main plica in contact with right leg. Palatal plicae typical of Plectopylis .

MEASUREMENTS (in mm). D = 12–14.1, H = 3.9–5.1 (NHMUK 1906.2.2.146, n = 4); D = 18.4–19.7, H = 5.6–5.9 (NHMUK 1906.2.2.263, n = 2).

Differential diagnosis

Plectopylis karenorum can be distinguished from all congeners by the flat, solid, thin-walled shell with shouldered body whorl and striped colouration.

Distribution

This species has been reported from several Burmese localities.

References

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].

Godwin-Austen H. H. 1875 b. Descriptions of five new Species of Helicidae of the Subgenus Plectopylis, with remarks on all the other known forms. Proceedings of the Zoological Society of London 1874: 608 - 613. Available from https: // biodiversitylibrary. org / page / 28502797 [accessed 30 Jul. 2018].

Gude G. K. 1897 b. Armature of Helicoid landshells. Science Gossip 3 (33): 244 - 246. Available from https: // biodiversitylibrary. org / page / 33878864 [accessed 30 Jul. 2018].

Gude G. K. 1899 d. Armature of Helicoid landshells and new sections of Plectopylis. Science Gossip 6 (65): 147 - 149. Available from https: // biodiversitylibrary. org / page / 34012981 [accessed 30 Jul. 2018].

Gude G. K. 1899 e. Armature of Helicoid landshells. Science Gossip 6 (66): 174 - 177. Available from https: // biodiversitylibrary. org / page / 34123273 [accessed 30 Jul. 2018].

Gude G. K. 1914 b. The Fauna of British India including Ceylon and Burma. Mollusca. ‾ II. (Trochomorphidae- - Janellidae). Taylor & Francis, London. Available from https: // biodiversitylibrary. org / page / 12910698 [accessed 30 Jul. 2018].

Hanley S. C. T. & Theobald W. 1870 - 1876. Conchologia Indica; Being Illustrations of the Land and Freshwater Shells of British India. L. Reeve & Co., London. Available from https: // biodiversitylibrary. org / page / 14402372 [accessed 30 Jul. 2018].

Nevill G. 1878. Hand list of Mollusca in the Indian Museum, Calcutta. Part I. Gastropoda. Pulmonata and Prosobranchia-Neurobranchia. Order of the Trustees, Calcutta. Available from https: // biodiversitylibrary. org / page / 19872326 [accessed 30 Jul. 2018].

Pfeiffer L. 1868. Monographia Heliceorum Viventium: Sistens Descriptiones Systematicas et Criticas Omnium Huius Familiae Generum et Specierum Hodie Cognitarum. Brockhaus, Leipzig. Available from https: // biodiversitylibrary. org / page / 12932069 [accessed 30 Jul. 2018].

Pfeiffer L. 1869. Novitates Conchologicae. Series Prima. Mollusca extramarina. Beschreibung und Abbildung, neuer oder kritischer Land-und Susswasser-Mollusken. (Mit Einschluss der Auricularceen). Band 3. Theodor Fischer, Cassel.

Tryon G. W. 1887. Manual of Conchology; Structural and Systematic. With Illustrations of the Species. Ser. 2, vol. 3. Helicidae, Volume I. Published by the Author, Philadelphia. Available from https: // biodiversitylibrary. org / page / 1287540 [accessed 30 Jul. 2018].

Figures

Fig. 35. Parietal (A–E, G, I–L, N) and palatal (F, H, M, O) plication of species of Plectopylis Benson, 1860. A. P. anguina Gould, 1847, paralectotype (NHMUK 20140812). B. P. repercussa Gould, 1856, lectotype (MCZ 169336). C. P. bensoni var. repercussoides Gude, 1899, holotype (NHMUK 1922.8.29.46). D. P. cairnsi Gude, 1898, holotype (NHMUK 1922.8.29.47). E–F. P. cairnsi (UF 76761). G–H. P. crassilabris sp. nov., paratype (UF 448577). I. P. cyclaspis Benson, 1859 (NHMUK 1906.02.02.148). J. P. karenorum (W. Blanford, 1865) from “Pegu”, Myanmar (NHMUK). K. P. linterae var. fusca Gude, 1898 (NHMUK 1888.12.04.1541–3). L–M. P. malayana sp. nov., paratypes from the type locality (coll PGB). N–O. P. thompsoni sp. nov., paratype (UF 448578). Arrows below the letters indicate the direction of the aperture. Not to scale.

Fig. 41. Shells and living specimens of species of Plectopylis Benson, 1860. A. P. crassilabris sp. nov., holotype (UF 279203). B. P. crassilabris sp. nov. (UF 346364). C–D. Living specimens photographed in the Khao Wong National Park, Aug.–Sep. 2010. E. P. cyclaspis (Benson, 1859) (NHMUK 1888.12.4.1520–1522). F. P. karenorum (W. Blanford, 1865), probable syntype (NHMUK 1906.2.2.263). Scale bar: A–B, E–F = 10 mm; C–D not to scale. Photos: T. Deli (A), B. Páll-Gergely (B), S. Damrongsiri (C–D) and H. Taylor (E–F).