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

scientific name

Chersaecia shiroiensis shiroiensis (Godwin-Austen, 1875)
status

 

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

Figs 24I–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.

NHMUK

Natural History Museum, London

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Stylommatophora

SuperFamily

Plectopyloidea

Family

Plectopylidae

SubFamily

Plectopylinae

Genus

Chersaecia

Loc

Chersaecia shiroiensis shiroiensis (Godwin-Austen, 1875)

Páll-Gergely, Barna 2018
2018
Loc

Chersaecia shiroiensis

Pall-Gergely B. & Budha P. B. & Naggs F. & Backeljau T. & Asami T. 2015: 10
2015
Loc

Plectopylis (Chersaecia) shiroiensis

Gude G. K. 1914: 105
Gude G. K. 1899: 148
Gude G. K. 1899: 175
1899
Loc

Plectopylis shiroiensis

Gude G. K. 1896: 155
1896
Loc

Helix (Plectopylis) shiroiensis

Tryon G. W. 1887: 163
Nevill G. 1878: 70
1878
Loc

Helix (Plectopylis) shiroiensis

Godwin-Austen H. H. 1875: 609
1875
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