Pseudopomatias eos Pilsbry & Hirase, 1905

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 : 34-35

Pseudopomatias eos Pilsbry & Hirase, 1905

Figs 5 E–F, 13D–E, G–H, 14A–E.

Pseudopomatias eos Pilsbry & Hirase, 1905 : pp 728–729. Pseudopomatias eos — Egorov 2013: p. 12, Fig. 18c.

Diagnosis. Shell small to medium sized, spindle-shaped; thin, ribs relatively strong, very regular on the whole shell, area between the ribs glossy; aperture "fat drop-shaped" (only the parietal-palatal transition is angled), apertural margin thin but reflexed.

Description. Shell very thin, translucent, yellowish or greenish, spindle-shaped; 6–6.75 (n=3) bulging whorls are separated by deep suture; protoconch consist of about 2 whorls; the sculpture of the first half-first whorl is smooth, finely granulated, than becomes regularly, very finely ribbed; teleoconch is regularly, finely ribbed even on the entire last whorl, no spiral lines visible; ribs normally developed, rather high but flat; on the last quarter of whorl they are sharper; aperture "fat drop-shaped" (columellar-parietal transition smooth, parietal-palatal transition angled), apertural rim slightly thickened and very much reflexed, consists of a weaker, slimmer inner and a wider outer circle; the boundary between the circles is hardly or sometimes not visible; parietal callus normally developed but weaker than the apertural rim; no plicae are visible inside the body whorl.

Measurements (in mm). H: 4.9–8.6, D: 2.8–3.3 (n=5, from different populations).

Reproductive anatomy ( Figs 14 A–C): The examined female specimen had very fragile (decayed?) body, therefore only limited information can be given for the reproductive anatomy. The exact boundary of the uterus and the bursa copulatrix could not be seen. The distal, thickened end of the bursa copulatrix was also damaged.

Rectum thick, attached to the uterus, all parts of the genitalia white or off-white, the inner wall of the bursa copulatrix is irridescent. Uterus large, tapers towards the distal end; bursa copulatrix long, slowly tapering toward its end; no distinct oviduct was detected (probably because of the decayed condition). A small spermatophore was found in the stalk of the bursa copulatrix ( Figs 14 B–C). It consisted of a larger, oval and a smaller, tumid portion.

Radula ( Figs 14 D–E): Radular teeth arranged in v-shaped rows, each transverse row with seven teeth (2-1-1- 1-2). Central tooth with well-developed, pointed central cusp and one, only slightly smaller, pointed lateral cusp on each side; lateral teeth with five cusps; the cusps are roughly of the same size, however the second cusp from lateral direction is usually the largest.

Differential diagnosis. Pseudopomatias eos has a thinner shell, more regular, stronger ribs and a more strongly reflexed peristome margin than most populations of P. amoenus . The aperture is more rounded than in amoenus , and it has a characteristic "fat drop" shape because of the smooth columellar-parietal transition and the angled parietal-palatal transition. P. amoenus usually possesses irregularly shaped aperture with two recognisable angles.

Type material. Lectotype, Hotawa, Taiwan, ANSP 89917.

Museum material. Asia, Japan, Formosa, Ako, coll. Yoichiro Hirase (date unknown) ex Barbour, MCZ 42909 (5 shells).

New material: Taiwan, Xinzhu Xian, Jianshi Xiang, Shangyulao, 1300 m asl, leg. Okubo, K., 7.8.1998., OK/ 1; Taiwan, Nantou Xian, Lugu Xiang, Xitou, Fenghuangshan Dengshandao, leg. Okubo, K., 24.8.1989.,OK/2; Taiwan, Nantou Xian, Xinyi Xiang, Dongpu, Caijiangpubu, 1420 m, leg. Okubo, K., 19.8.1991., OK/2; Taiwan, Nantou Xian, Renai Xiang, Songgang, leg. Okubo, K., 22.8.1990., OK/2; Taiwan, Nantou Xian, Renai Xiang, Meifeng, leg. Okubo, K., 22.8.1995., OK/2; Taiwan, Nantou Xian, Renai Xiang, 8Hao Hehuansuidao, leg. Okubo, K., 6.8.1998., OK/2; Taiwan, Nantou Xian, Renai Xiang, Dayuling, leg. Okubo, K., 2565 m, 12.8.1998., OK/2; Taiwan, Gaoxiong Xian, Taoyuan Xiang, Tengzhisenlinyoulequ, leg. Okubo, K., 28.6.1997., OK/3; Taiwan, Pingdong Xian, Majia Xiang, Majiacun, 780 m, leg. Okubo, K., 21.8.1994., OK/2; Taiwan, Hualian Xian, Xiulin Xiang, Guanyuan, 2300 m, leg. Okubo, K., 17.8.1991., OK/2; Hualian Xian, Xiulin Xiang, Bilushenmu, leg. Okubo, K., 10.8.1998., OK/2; Taiwan, Nantou Xian, Renai Xiang, Songgang, leg. Ohara, K., 0 3.05.1982., OK/5, PGB/1; Hualien Xian, Shoufeng Xiang, Chinan Cun, Liyu Tan, Huantan Rd. 800 m, 165 m asl, 23°56.098'N 121°30.755'E, leg. Hunyadi, 0 7.10.2014. (2014/77), HA/10; Nantou Xian, Renai Xiang, Meifeng SE 600 m, sideroad 600 m, 2065 m asl., 24°05.474'N, 121°10.570'E, leg. Hunyadi 20.10.2014. (2014/107), HA/7; 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. (2014/108), HA/2 (used for molecular study).

Distribution ( Fig. 11 ): The type locality (Hotawa) is situated near Jiaxian, Kaohsiung County, southern Taiwan (see Wu et al. 2008). Additional material suggests that the species inhabits almost the whole island.

Remarks. The shells from Tengzhisenlinyoulequ are larger (8.5–8.7 mm), lighter in colour, their shape is slightly more tumid and have less reflexed apertural lip. More material is necessary to see if they belong to a different species.

Figures

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 11. Distribution of Pseudopomatias species. Filled circle: P. pe g ue ns i s (Theobald, 1864); open triangle, top up: P. nitens n. sp.; open circle: P. amoenus Möllendorff 1885 s. l.; empty square: P. e o s Pilsbry & Hirase 1905; script " Shan States ": Pseudopomatias shanensis n. sp. The meaning of the numbers: 1: Sandoway, 2: Pegu, 3: locality of P. amoenus near Jiuxiang Fengjingqu, 4: locality of P. amoenus near Kongshan Cun, 5: Northern Vietnamese and Chinese localities of P. amoenus and P. nitens n. sp., 6: Mau Son, That Khé and the new localities of " typical fulvus " (= P. amoenus), 7: Xuan Son National Park; 8: Cuc Phuong National Park, 9: Chengkou (type locality of Fargesia cornea), 10: locality near Mufu Cun (new locality of typical P. amoenus), 11: Badong (type locality of P. amoenus), 12: Changyang (locality of P. nitens n. sp.), 13: Hengshan (possible position of the type locality of P. amoenus var. tumidula), 14: Guiyan Xian (possible position of the type locality of P. amoenus var. tumidula), 15: Nanling Guojia (see Hu et al. 2004).

FIGURE 14. Anatomy of Pseudopomatias eos (for locality, see Figs 5 D – E). A. reproductive anatomy, B – C. spermatophore (from two views), D – E. radula. Abbreviations: BC: bursa copulatrix, R: rectum, U: uterus.