Chersaecia woodthorpei (Gude, 1899), 2018

Páll-Gergely, Barna, 2018, Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae), European Journal of Taxonomy 455, pp. 1-114 : 67-68

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.3818740
persistent identifier	https://treatment.plazi.org/id/03CC87A0-6C6E-8A64-FE09-F9E7449FFAFC
treatment provided by	Valdenar (2020-05-08 18:45:36, last updated 2025-02-20 12:21:53)
scientific name	Chersaecia woodthorpei (Gude, 1899)
status	comb. nov.

Treatment

Chersaecia woodthorpei (Gude, 1899) View in CoL comb. nov.

Figs 24 View Fig M–N, 30C

Plectopylis woodthorpei Gude, 1899b: 15–16 View in CoL , fig. 98a–g [“Fort Stedman, Burma ”].

Plectopylis (Plectopylis) woodthorpei View in CoL – Gude 1899d: 148; 1899e: 175; 1914b: 124–126, fig. 61a–h. Plectopylis (Chersaecia) woodthorpei View in CoL – Gude 1920: 61.

Diagnosis

A very small, sinistral species with an angulated body whorl and a very slightly elevated spire; parietal wall with two lamellae, a main and an intermediate parietal plicae, both of which are in contact with the anterior lamella; palatal wall with an overall Plectopylis -like palatal plication, with three additional horizontal plicae anterior to the vertical plate, which is formed by the fourth and fifth plicae.

Material examined

Syntypes MYANMAR: 3 shells, Burmah, Fort Stedman, Woodthorpe leg. ( NHMUK 1903.7.1.2100).

Additional material MYANMAR: 6 shells, E. Burmah, coll. Godwin-Austen ( NHMUK).

Description

SHELL. Sinistral, small, with very slightly elevated spire; whorls shouldered, which results in a nearly flat dorsal surface; fresh shells light brown; protoconch consists of 2.5 whorls, finely tuberculated; dorsal side and area inside umbilicus dominated by reticulated sculpture; periphery of body whorl dominated by radial lines; whorls 6–6.75 (n = 3), separated by moderately deep suture; peristome thickened and strongly reflected; parietal callus very strong, elevated, sharp, V-shaped, with the upper part of the V being shorter; apertural fold connected to parietal callus.

Two opened shells were examined. Parietal wall with a curved, long, posterior, and a shorter anterior lamella; main and intermediate plicae in contact with anterior lamella; main plica connected to apertural fold; intermediate plica about half as long as main plica; lower plica slightly extends beyond posterior lamella in posterior direction, and reaches peristome. Palatal plicae Plectopylis -like, with three additional horizontal plicae anterior to the vertical plate, which is formed by the accretion of the fourth and fifth plicae.

MEASUREMENTS (in mm). D = 8.8–9.9, H = 3.6–4.8 (syntypes, n = 2).

Differential diagnosis

The carinate shell and the horizontal palatal plicae anterior to the vertical plate make the identification of the species easy. A population of Chersaecia perrierae is similar in shape, but it has a single lamella. See also under that species.

Distribution

Chersaecia woodthorpei is known from the type locality only.

References

Gude G. K. 1899 b. Armature of Helicoid landshells and a new species of Plectopylis. Science Gossip 6 (61): 15 - 17. Available from https: // biodiversitylibrary. org / page / 34012896 [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].

Gude G. K. 1920. Presidential address. The armature of land Mollusca. Proceedings of the Malacological Society of London 14 (2 - 3): 52 - 73. Available from https: // biodiversitylibrary. org / page / 30346763 [accessed 30 Jul. 2018].

Figures

Fig. 24. Parietal (A, C, E, G, I, K, M, O) and palatal (B, D, F, H, J, L, N, P) plication of species of Chersaecia Gude, 1899. A–B. C. perrierae (Gude, 1898) (after Gude 1914b). C–D. C. refuga (Gould, 1846) (NHMUK 20170162). E–F. C. shanensis (Stoliczka, 1873), loc. 20091018B (coll. PGB). G–H. C. shanensis, loc. 20091018C (coll. PGB). I–J. C. shiroiensis shiroiensis (Godwin-Austen, 1875) (after Gude 1896a). K–L. C. shiroiensis subnagaensis subsp. nov., holotype (NHMUK 1903.7.1.753.1). M–N. C. woodthorpei (Gude, 1899) comb. nov. (after Gude 1914b). O–P. C. scabra sp. nov. (UF 380244). Arrows below the letters indicate the direction of the aperture. Not to scale.