Chersaecia shiroiensis shiroiensis (Godwin-Austen, 1875)

Páll-Gergely, Barna, 2018, Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae), European Journal of Taxonomy 455, pp. 1-114 : 65-66

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.3818736
persistent identifier	https://treatment.plazi.org/id/03CC87A0-6C6C-8A66-FE45-F9C843E1F9C6
treatment provided by	Valdenar (2020-05-08 18:45:36, last updated 2025-02-20 12:52:31)
scientific name	Chersaecia shiroiensis shiroiensis (Godwin-Austen, 1875)
status

Treatment

Chersaecia shiroiensis shiroiensis (Godwin-Austen, 1875) View in CoL

Figs 24 View Fig I–J, 30A

Helix (Plectopylis) shiroiensis Godwin-Austen, 1875b: 609 , 613, pl. 73, fig. 3–3c [“slopes of the peak of Shiroifurar, N.E. of Munipúr, at an altitude of from 8000 to 9000 feet ”].

Helix (Plectopylis) shiroiensis – Hanley & Theobald 1876: 64, pl. 159, fig. 7. — Nevill 1878: 70. — Tryon 1887: 163, pl. 35, fig. 90.

Plectopylis shiroiensis View in CoL – Gude 1896a: 155–156, fig. 20a–d.

Plectopylis (Chersaecia) shiroiensis View in CoL – Gude 1899d: 148; 1899e: 175; 1914b: 105–106, fig. 49a–d.

Chersaecia shiroiensis View in CoL – Páll-Gergely et al. 2015c: 10.

Diagnosis

Intermediate and lower plicae present.

Material examined

Syntypes INDIA: 10 shells, Naga Hills, Shiroifurar ( NHMUK 1903.7.1.747).

Additional material

INDIA: 2 shells, Naga Hills, Japvo Pk, 10 000 ft a.s.l., coll. Godwin-Austen ( NHMUK 1903.7.1.748); 1 shell, Naga Hills, Kopamedza Pk, coll. Godwin-Austen ( NHMUK 1903.7.1.775); 1 shell, Burrail, Japvo Pk., coll. Godwin-Austen ( NHMUK); 1 shell, Naga Hills, Ogle leg., coll. Godwin-Austen ( NHMUK 1903.7.1.232); many shells, Shiroifurar, NE Manipur, Assam, coll. Godwin-Austen ( NHMUK); 1 shell, Munipur, 1875, Nevill leg. ( NHMUK 1891.3.17.350–351); 3 shells, India ( NHMUK 1909.1.26.74[?]); 2 adult shells, 1 juv. shell, Gazifhima, Lahupa, Naga Hills, Godwin-Austen leg. ( NHMUK 1903.7.1.778).

Description

SHELL. Sinistral, light brownish or yellowish, small, spire slightly elevated; protoconch consists of 2.25 whorls, separated by shallow suture, finely, rather regularly wrinkled with extremely fine granular structure; entire shell with 5.5–6 whorls (n = 4); suture of teleoconch deep; teleoconch finely reticulated, radial lines usually dominant, but on dorsal side of last whorl spiral lines stronger; ventral surface also reticulated; aperture semilunar; peristome white, conspicuously thickened and strongly reflected; parietal callus V-shaped with the upper part of V being shorter; apertural fold prominent, continuous with main plica; periumbilical region slightly keeled, last half whorl slightly angulated and dorsolaterally depressed; last half whorl flares away from umbilicus; this modifies the regular infundibular shape of umbilicus (behind aperture, inside the last half whorl there is a slight canal).

Five shells were opened. Parietal wall with a vertical lamella, which has the upper end slightly, and the lower end more strongly elongated posteriorly; main plica free from lamella, in contact with apertural fold; main plica slightly curved, its middle portion situated closer to upper suture than its two ends; lower plica starts under lamella, slightly shorter than lamella; intermediate plica approximately as long as lamella, free from it. Palatal plicae six; first and second straight, third slightly oblique; fourth and fifth almost vertical; last one extremely long and rather straight, runs along periumbilical keel; there is an additional free denticle posteriorly.

MEASUREMENTS (in mm). D = 8–8.3, H = 4.4–4.5 (NHMUK 1903.7.1.778, n = 2).

Differential diagnosis

See under Chersaecia shiroiensis subnagaensis subsp. nov.

Distribution

The nominotypical subspecies is known from a few localities from the Naga Hills of India.

References

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. 1896 a. Armature of Helicoid landshells. Science Gossip 3 (30): 154 - 156. Available from https: // biodiversitylibrary. org / page / 33878774 [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].

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].

Pall-Gergely B., Budha P. B., Naggs F., Backeljau T. & Asami T. 2015 c. Review of the genus Endothyrella Zilch, 1960 with description of five new species (Gastropoda, Pulmonata, Plectopylidae). ZooKeys 529: 1 - 70. https: // doi. org / 10.3897 / zookeys. 529.6139

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. 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.