Serina soluta (Möllendorff, 1901), Mollendorff, 1901

Wu, Min & Xu, Qin, 2013, Serina Gredler (Gastropoda, Stylommatophora: Enidae), the continuous-peristomed mountain snails endemic to the eastern slope of the Qinghai-Xizang Plateau, Zootaxa 3620 (1), pp. 43-66 : 57

7. Serina soluta (Möllendorff, 1901)

Figs. 1 , 5 F–G, 7; Tables 1 , 3

Buliminus (Serina) solutus Möllendorff, 1901: 361 , pl.16, figs. 15–18. Buliminus (Serina) solutus— Kobelt, 1902: 863, pl. 123, figs. 15–18.

Ena (Serina) soluta— Haas, 1933: 319; Yen, 1938: 442.

Serina soluta soluta— Yen, 1939: 87, pl. 8, fig. 21; Chen, Zhou, Luo & Zhang, 2003: 442.

Type locality. Wa-sy-kou and Liu-ting near Tung valley (respectively Wasigou and Luding in modern spelling, Sichuan).

Material examined. SMF-42047: Lectotype (Yen, 1939: 87); Wa-sy-kou am Tung, China. ZI RAS- N–294: 1893–IV–15. ZI RAS-N–284: type material, 1893–VII–15. NHM-Trechmann Acc. No. 2176: 1 fms, Tibet.

Distribution. Sichuan (type locality).

Diagnosis. Shell with the most swollen part occurred at penultimate whorl and body whorl. Whorls with a narrow, defined zone below the suture. Last whorl straight or descending in front; rounded at periphery. Aperture not duplicate; separated from body whorl; not armed.

Shell. Fusiform; with apex not abruptly pointed; dextral; with the most swollen part occurred at penultimate whorl to body whorl; height 11.9–13.2–14.3, diameter major 4.6–5.2–5.8, ratio of height /diameter major 2.32–2.57–2.79. Growth lines fine and clear. Whorls 7 1/2–8 1/2-–9, convex; with or without a narrow, defined zone below the suture. Embryonic shell 1 1/2–1 5/8+–1 7/8 whorls. Postnuclear whorls smooth. Last whorl straight or descending in front; rounded at periphery; abaperturally very obscurely with a rugate region with crowded and/or thickened growthline-like folds. Aperture in a plane and straight, or wavy; subcircular; oblique; separated from body whorl; not armed; height 3.7–4.0–4.6, width 2.8–3.1–3.7, ratio of shell height /apertural height 2.91–3.32–3.51. Aperture not duplicate. Peristome and parietal callus almost completely fusing except for a channel at upper insertion of peristome. Reflexed part of peristome straight and not curved backward. Columellar margin reflexed. Columella arched. Umbilicus narrowly open. Shell uniformly light yellowish brown. Aperture dirty white. Measured specimen: SMF-42047, 1 shell.

Figures

FIGURE 1. Distribution of Serina species. S. soluta inflata Yen, 1939 is also indicated although synonymized in this paper. S. soluta stenochila (Möllendorff, 1901) is not mapped due to imprecise locality information.

FIGURE 5. A, B. Serina ser Gredler, 1898. A. SMF- 42036, Wangjiaba. B. ZI RAS N 76. C-E. Serina subser Gredler, 1898. C. NHM- 1902.5.13.23 – 24, Gansu. D. SMF- 42045, Wudu. E. HBUMM- 05392 – specimen 22, Lixian. F-K. Serina soluta (Möllendorff, 1901). F. NHM-Trechmann Acc. No. 2176, Dangchang. G. SMF- 42047, Wasigou. H, I. Serina soluta inflata Yen, 1939. H. HBUMM- 04318 – specimen 2, Luding. I. SMF- 42095, holotype, Kangding. J, K. Buliminus soluta stenochila Möllendorff, 1901. J. SMF- 42048, lectotype, valley of Daduhe River. K. SMF- 42049, paralectotype. L. Serina vincentii (Gredler, 1898), SMF- 42032, between Tshun-dshia-wan and Wangjiaba. M, N. Serina denticulata n. sp. M. HBUMM- 00281 – specimen 5, holotype, Daigusi. N. HBUMM- 00281 – specimen 6, paratype, Daigusi.