Serina cathaica Gredler, 1898

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 : 46-49

2. Serina cathaica Gredler, 1898

Figs. 1 , 2 B–C; Tables 1 , 3

Serina cathaica Gredler, 1898a: 11 , T. F. 7.

Serina cathaica— Gredler, 1898b: 106. Yen, 1939: 87, pl. 8, fig. 20. Yen, 1942: 255. Chen, Zhou, Luo & Zhang, 2003: 442. Buliminus (Serina) cathaicus— Möllendorff, 1901: 360, pl.16, figs. 11–14. Kobelt, 1902: 862, pl. 123, figs. 11–14.

Type locality. Between Yulinkuan and Wenxian (Gansu) .

Material examined. ZI RAS (not numbered): 1 juv. NHM-1902.5.13.19 Reg.: 1 fms (measurements: wh 9.000, h 10.6 mm, w 2.8 mm, aph 3.0 mm, aw 2.4 mm); Gansu. SMF-42046: 4 fms.

Distribution. S Gansu.

Diagnosis. Shell with the most swollen part occurred at penultimate whorl. Whorls with a narrow, defined zone below the suture. Last whorl ascending immediately near aperture; straight at periphery; completely attached to body whorl. Aperture not duplicate.

Shell. Turrited, or ovate-turriform; dextral; with apex not abruptly pointed; with the most swollen part occurred at penultimate whorl; height 9.7–10.4–11.4, diameter major 2.8–3.0–3.3, ratio of height /diameter major 3.30–3.45–3.68. Growth lines fine and clear. Whorls 8 1/8–8 3/8–8 5/8, convex; with a narrow, defined zone below the suture. Embryonic shell 1 1/4–1 1/2+–2 whorls. Postnuclear whorls smooth. Last whorl ascending immediately near aperture; straight at periphery; with a rugate region with abapertural crowded and/or thickened growthline-like folds. Aperture in a plane and straight; ovate; almost vertical; completely attached to body whorl; height 2.7–2.9–3.4, width 2.0–2.4–2.8, ratio of shell height /apertural height 3.37–3.59–3.83. 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. Abapertural peripheral depression on body whorl spirally extending for ca. 1 whorl. Columellar margin reflexed. Columella arched. Umbilicus narrowly open. Shell uniformly chestnut, with aperture identically or brightly coloured. Measured specimens: SMF-42046, 4 shells.

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 2. A. Serina belae (Hilber, 1883), SMF- 42069, paratype, Bangda. B, C. Serina cathaica Gredler, 1898: B. SMF- 42046, between Yue-lin-kuan and Wen-hsien. C. NHM- 1902.5.13.19. D. Clausiliopsis szechenyi (Böttger, 1883), syntype of B. sobrina Preston, NHM- 1912.3.26.9, Gansu. E – J. Serina egressa Sturany, 1900. E. NHM- 1902.5.13.21, Gansu. F. HBUMM- 05426 – specimen 21, Wenxian. G. HBUMM- 05426 – specimen 23, Wenxian. H. SMF- 42038 (from type locality, between Yuelin-kuan and Wen-hsien). I. HBUMM- 5673 – specimen 22, Lianghekou. J. HBUMM- 5673 – specimen 23, Lianghekou. K – O. Serina prostoma (Ancey, 1884). K. NHM- 1912.6.27.69 – 71. L. A paratype of Buliminus (Holcauchen) tubios Annandale, 1924, NHM- 1923.5.24.17 – 36, Gorge of Mekong above Yangtze. M. SMF- 42050, paratype, Dshy-kow. N. HBUMM- 04296 – specimen 25, Yanjing. O. HBUMM- 04296 – specimen 24, Yanjing.

Tables

TABLE 1. Shell measurements of Serina species (specimen lots: Serina belae, SMF- 42069; S. cathaica, SMF- 42046; S. egressa, HBUMM- 05426 + 05464 + 05538 + 05563 + 05648 + 0 5673, SMF- 42038; S. prostoma, NHM- 1912.6.27.69 - 71 + 1923.5.24.17 - 36, SMF- 42050, HBUMM- 04287 - + 04296; S. ser, SMF- 42036; S. subser, HBUMM- 00287 + 05796 + 05709 + 0 5392, SMF- 42041; S. soluta, SMF- 42095 + 42096 (S. soluta “ inflata ”), SMF- 42048 + 42049 (S. soluta “ stenochila ”), SMF 42047, HBUMM- 04318; S. vincentii, SMF 42032; S. denticulata n. sp., HBUMM- 00281).

Species	n	Wh	Ewh	H (mm)	W (mm)
Serina belae	1	9 5/8	1 5/8	12.4	3.9
S. cathaica	4	8 1/8–8 3/8–8 5/8	1 1/4–1 1/2+–2	9.7–10.4–11.4	2.8–3.0–3.3
S. egressa	114	8–9 1/8+–10 1/2	1 1/2–1 3/4—2 1/8	10.1–11.5–14.1	3.1–3.7–4.2
S. prostoma	45	7 7/8–8 1/2–9 1/4	1 5/8–1 7/8+–2 1/8	11.2–13.3–14.9	3.4–4.5–5.5
S. ser	6	8 3/4–9 1/8–9 5/8	1 1/2–1 5/8-–1 3/4	12.2–13.0–14.5	4.1–4.6–4.9
S. subser	48	8 1/4–9 3/8-–11	1 1/2–1 3/4-–2	10.6–12.1–14.4	3.1–3.6–4.1
S. soluta	18	7 1/2–8 1/2-–9	1 1/2–1 5/8+–1 7/8	11.9–13.2–14.3	4.6–5.2–5.8
S. vincentii	3	6 7/8–7 1/8–7 1/2	1 1/2-1 1/2-1 1/2	8.0–8.6–8.9	5.0–5.1–5.3
S. denticulata n. sp.	19	8 1/8–8 3/4-–9 1/4	1 5/8–1 3/4+–2	10.2–11.5–13.9	3.5–3.9–4.5
continued.
Species	n	H/W	Aph (mm)	Apw (mm)	H/Aph
Serina belae	1	3.17	3.3	2.8	3.71
S. cathaica	4	3.30–3.45–3.68	2.7–2.9–3.4	2.0–2.4–2.8	3.37–3.59–3.83
S. egressa	114	2.62–3.09–3.66	2.9–3.3–3.7	2.3–2.9–3.4	2.91–3.41–4.14
S. prostoma	45	2.53–2.96–3.50	3.2–3.9–4.5	2.8–3.5–3.9	2.99–3.41–4.02
S. ser	6	2.66–2.83–2.96	3.5–3.9–4.7	3.1–3.4–4.0	3.11–3.38–3.52
S. subser	48	2.58–3.35–4.21	2.7–3.3–3.7	2.1–2.6–3.0	3.29–3.68–4.44
S. soluta	18	2.32–2.57–2.79	3.7–4.0–4.6	2.8–3.1–3.7	2.91–3.32–3.51
S. vincentii	3	1.61–1.66–1.69	3.5–3.7–3.9	3.5–3.6–3.7	2.30–2.30–2.50
S. denticulata n. sp.	19	2.66–2.94–3.35	3.0–3.5–3.8	2.5–2.8–3.0	2.96-3.30-3.82