Laeocathaica potanini Moellendorff, 1899

Figs 2A, 3, 24C, D, 28, 43C, 45A, B, 51

Laeocathaica potanini Möllendorff, 1899: 96, pl. 6, fig. 5; - Wiegmann 1900: 109, pl. 3, figs 98-100; - Gude 1902: 6; - Yen 1939: 149, pl. 15, fig. 38; - Yen 1942: 284; - Chen and Zhang 2004: 326, fig. 316; - Páll-Gergely et al. 2022: 70, fig. 23A, B.

Laeocathaica (Laeocathaica) potanini - Zilch 1968: 174; - Richardson 1983: 79.

Museum material.

SMF 9082, lectotype; Wenhsien, S-Gansu; Potanin 251, 587, 734, Slg. O. v. Möllendorff . SMF 9083, paratypes, three fms; Same data as lectotype. SMF 8960, paratype; Hungdan (= Hengdan) b. Wen-hsien, S-Gansu; ex Beresowski, Slg. O. v. Möllendorff .

New material.

HBUMM00633, many fma; 4 fma dissected; Yuxushan, Wenxian, Gansu Province, 1000 m a.s.l., near 32.957259°N, 104.689152°E, shrubs and slate, 1998-V-17, coll. Chen, D.-N. and Zhang, G.-Q. HBUMM00700, 5 fma and 2 juvs; Hejiaping [何家坪], Wenxian, Gansu Province, near 32.844062°N, 105.021857°E; 1998-IV-24, coll. Chen, D.-N. and Zhang, G.-Q. HBUMM05423, 4 juvs; hill foot of Yuxushan, Wenxian, Gansu Province; slate and shrubs, dry; 2006-IX-27, coll. Wu, M., Liu, J.-M., Zheng, W. and Gao, L.-H. HBUMM05427, many fma and fms; DNA voucher HBUMM05409. HBUMM05438, 4 fma, 7 fms, 7 juvs: Yuxushan, Wenxian, Gansu Province, 32.957259°N, 104.689152°E, shrubs and slate, 2006- IX-27, coll. Wu, M., Liu, J.-M., Zheng, W. and Gao, L.-H. HBUMM06483, Yuxushan, Wenxian, Gansu Province, 1070 m a.s.l., 32.959861°N, 104.678222°E; shrubs and slate; 2011-VIII-07, coll. Wu, M., Xu, Q. and Budha, P. (not dissected) ; DNA voucher HBUMM06482. HBUMM06520, 3 fms and 2 juvs; town of Wenxian, Gansu Province, 1024 m a.s.l., 32.941111°N, 104.668889°E; 2011-VIII-08, coll. Wu, M., Xu, Q. and Budha, P. HBUMM08427, slope near X496, Wenxian, Gansu Province, near 32.474345°N, 104.915976°E, on slope; 2019-X-13, coll. Li, Q.-M. (not dissected) ; DNA voucher HBUMM08427a. CZG202008-w1, 7 fms and many juvs, town of Wenxian, Gansu Province, 2020-VIII, coll. Chen, Z.-G.

Distribution.

Gansu: Wenxian (type locality).

Additional information of shell.

Granules on protoconch can only be unclearly and partially observed near suture because of erosion or weathering in adults. Granules are short (~ 20 µm long) on fine threads. Spiral grooves are absent throughout. On teleoconch whorls, fine threads are present between every two adjacent ribs.

General anatomy.

Eversible head wart present. Jaw arcuate, with five projecting ribs.

Anatomy of genital organs.

Penial sheath short, covering ~ 1/6 of penis. Penis tubular, somewhat expanded distally. Inside penis, ~ 5 low pilasters present proximally, another two high pilasters fusing into one Y-shaped fork at proximal 1/2. Fine pilasters on distal end of penis merging into ~ 4 thick folds. Vas deferens narrow throughout. Vagina between atrium and dart sac not elongated. Vagina between dart sac and insertion of bursa copulatrix duct ~ 1/2 length of dart sac. Dart sac ~ 1/2 length of penis. Love dart ~ 6 mm long, apically rhombic in cross-section, subsequently 2-bladed. Accessory sac small but externally distinguishable, internally solid, inserting into dart sac at middle part, opening to dart chamber. Mucous glands two (n = 3) or three (n = 1), each complicatedly branched. Proximal accessory sacs two, symmetrical, apically separated and ventrally touching, each distally with an opening leading to proximal dart chamber. Bursa copulatrix duct basally thick. Bursa copulatrix ovate, small.