Pseudopomatias siyomensis Godwin-Austen, 1917

Páll-Gergely, Barna, Fehér, Zoltán, Hunyadi, András & Asami, Takahiro, 2015, Revision of the genus Pseudopomatias and its relatives (Gastropoda: Cyclophoroidea: Pupinidae), Zootaxa 3937 (1), pp. 1-49 : 28-29

Pseudopomatias siyomensis Godwin-Austen, 1917

Fig. 10 C

Pseudopomatias siyomensis Godwin-Austen, 1917 : p. 578, Figs 5 a, 6c. Pseudopomatias siyomensis — Gude 1921, pp 160–161.

Diagnosis. A large species with strong, widely-spaced ribs and well-developed peristome consisting of two readily distinguishable circles.

Description. The only known shell is corroded, the shell colour and the sculpture of the protoconch could not be observed; shell slender turriform; whorls 9 in number and they are moderately bulging, separated by rather deep suture; teleoconch finely, regularly ribbed even behind the aperture, where the spaces between the ribs are wider than on the previous whorls; ribs seem to be stronger behind the aperture; aperture rounded with not angled columellar-parietal transition and slightly angled parietal-palatal transition; peristome very much thickened and slightly reflexed; it consists of a slimmer, protruding inner and a wider outer circle.

Measurements (in mm). H: 12.2, D: 4.9 (n=1).

Differential diagnosis. P. siyomensis is larger than P. himalayae , P. abletti n. sp. and P. harl i n. sp. Moreover, P. himalayae has a wider shell and more bulging whorls, and its aperture is oblique in lateral view; P. abletti n. sp. has "reversed oblique", rather triangular aperture; P. ha r l i n. sp. has turriform shell shape, lower ribs and a thinner apertural lip, which is not divided into two separated circles. P. rei schuetzi n. sp. is slightly more slender, has a thinner apertural rim and almost smooth neck area (last half of whorl).

Type material. Siyom, Abor Hills, leg. Captain Oakes, coll. Godwin-Austen, NHMUK 3406.03.7.1. (holotype).

Distribution. P. siyomensis is known from the type locality only. See also Fig. 2 and Table 3 .

Figures

FIGURE 2. Different areas of north-eastern India mentioned in the text. See also Table 3. 1: Sikkim, 2: Aka Hills, 3: Garo Hills, 4: Khasi Hills, 5: Dafla Hills, 6: Abor Hills, 7: Naga Hills.

FIGURE 5. SEM images of the protoconch (A – B) and operculum (C, E – F: outer side, D: inner side) of Pseudopomatias sp. A. P. nitens n. sp., HNHM 98834; B. P. amoenus Möllendorff 1885, China, Yunnan, Yiliang Xian, Jiuxiang Fengjingqu, 1818 m, 25 ° 04.27306 ' N, 103 ° 22.87032 ' E, leg. Nakahara, Y., Ohara, K., Okubo, K. & Otani, J. U., 10.06. 2005., coll. PGB; C. P. amoenus, Indochine, leg. Messager, MNHN 2012 - 26983; D. P. amoenus, Tonkin, Muong-Hum, between Muong-Hum and the Clouds Pass (Col de Nuages), near the latter one, more than 2000 m a. s. l., leg. Messager, MNHN 2012 - 26997; E – F. P. e o s, Nantou Xian, Renai Xiang, Meifeng-Songgang road, around km 14, 2120 m asl., 24 ° 05.103 ' N 121 ° 10.257 ' E, leg. Hunyadi, 20.10. 2014.

FIGURE 10. A. Pseudopomatias prestoni n. sp., holotype, NHMUK 20130423.1; B. P. prestoni n. sp., Indien, NHMW 109194; C. P. siyomensis Godwin-Austen, 1917, holotype, NHMUK 3406.03.7.1; D. P. himalayae, Himalaya, Darjiling, NHMUK 1860.6.27.32.1; E. P. himalayae, syntype, UMZC 102695; F. P. peguensis (Theobald, 1864), Pegu, Burmah, NMW. 1894.015; G. P. shanensis n. sp. holotype, NHMUK 1903.7.1.1631.1; H. P. reischuetzi n. sp., holotype, NHMUK 1903.7. 1.1549. 1. Photos: A, C – D, G – H: H. Taylor; B: J. Harl; E: J. Gundry; F: B. Rowson. Scale bars = 5 mm; the smaller one refers to the photos of the whole shell, the larger one refers to the photos showing the lateral and basal side of the shells.