Vanmanenia striata Chen, 1980

Li, Xu, Zhou, Wei & Che, Xing-Jin, 2019, Loaches of Vanmanenia (Cypriniformes: Gastromyzontidae) from Yunnan, China with Description of a New Species, Zootaxa 4603 (1), pp. 125-144 : 137-140

Vanmanenia striata Chen

( Fig. 7 )

Ƒanmanenia striata Chen 1980: 101 (Xiaguan, Yuan-jiang drainage, Yunnan); Zheng et al., 1982: 393 (Yuan-jiang drainage). Ƒanmanenia tetraloba: Chen 1990 (in part): 85 (Yuan-jiang drainage, Yunnan); Chen & Tang 2000 (in part): 465 (Yuan-jiang drainage, Yunnan).

Material examined: SWFC 0111053–0111054, 0 112016, 0411534–0411535, 5 ex., 66.2–84.0 mm SL, China: Yunnan: Wenshan County: Gaji; SWFC 0 1111 80–0111183, 0111289–0111291, 0 111252, 0111256–0111260, 13 ex., 55.9–100.1 mm SL, China: Yunnan: Wenshan County: Namoguo; SWFC 0 11 1001–0111002, 2 ex., 79.0–91.0 mm SL, China: Yunnan: Wenshan County: Laojunshan; SWFC 0111314–0111315, 0411324–0411330, 0411537– 0 411564, 37 ex., 71.1–105.6 mm SL, China: Yunnan: Wenshan County: Yaodian; SWFC 0 60 5021–0605044, 24 ex., 66.6–99.2 mm SL, China: Yunnan: Yuanjiang County: Yinyuan,; SWFC 9902103, 1 ex., 78.4 mm SL, China: Yunnan: Xinping County: Xinhua; SWFC 0 0 0 5091, 1 ex., 85.3 mm SL, China: Yunnan: Xinping County: Sanjiangkou; SWFC 0310135–0310144, 0402035–0402054, 30 ex., 50.8–94.0 mm SL, China: Yunnan: Nanjian County: Julihe.

Diagnosis: Vanmanenia striata is distinguished from the congeners belonging to the barred group in Vanmanenia by the following combination of characters: the dorsal part of the head covered with several dark brown vermiculations (vs. a large black blotch in V. microcephala , V. crassicauda , and V. serrilineata ); the gill opening larger and its upper angle level to the middle point of the eye (vs. the gill opening smaller and its upper angle level with the lower edge of the eye in V. microcephala ); the flank with 16–21 vermiculations with widths smaller than the eye diameter (vs. 10–21 regular bars with widths approximately equal to the eye diameter in V. microcephala ); dorsal part of the body with 7–9 black saddles (vs. 4–5 in V. microcephala , V. crassicauda , and V. serrilineata ); the patch of the caudal-fin base dissociated and not connected to the upper and lower margins of the caudal peduncle (vs. complete and not connected to the upper and lower margins of the caudal peduncle in V. tetraloba ); and the flank with 16–21 vermiculations with widths smaller than the eye diameter (vs. 10–21 regular bars with widths approximately equal to the eye diameter in V. tetraloba ) ( Tables 1 , 3 ).

Morphometric data shown in Table 3 .

Distribution: Known from the main stream and branches of the Yuan-jiang drainage (the upper Red River) ( Fig. 4 ).

Remark: Chen (1990) did not give reasoning for regarding Vanmanenia striata as the synonym of Vanmanenia tetraloba . Moreover, he classified all the loaches of Vanmanenia from the Lancang-jiang, Yuan-jiang, and Jinsha-jiang drainages under the name of Vanmanenia tetraloba , which led to taxonomic confusion of the genus Vanmanenia in Yunnan.

According to the original description of Vanmanenia tetraloba (= Homalosoma tetraloba Mai, 1978: 211 ), the types were collected from “Ca Vay Bang Tay Bac.” “Tay Bac” means Northern Vietnam, including Hoa Binh, SƠn La, Lai Chau, and Dien Bien Phu. The rivers in “Tay Bac” all belong to Song Da (also known as the Black River) drainage, and the Lixian-jiang is its upper reaches in Yunnan, China. Therefore, the only species of Vanmanenia occurring in the Lixian-jiang should be the true V. tetraloba . The species of Vanmanenia occurring in the Yuanjiang (the upper Red River) and its tributaries should be V. striata Chen (1980) ; V. striata should therefore be restored as a valid species. Although we have asked Prof. E. Zhang and Dr. L. Cao to examine the types of Vanmanenia striata preserved in the Institute of Hydrobiology, Chinese Academy of Sciences, they replied that they could not find these types.

Figures

FIGURE 4. Localities of examined material of Ƒanmanenia. A symbol may represent several adjacent localities. 1—Lancangjiang drainage (the upper Mekong River); 2—Lixian-jiang (first branch of the Red River); 3—Yuan-jiang (the upper Red River); 4—Jinsha-jiang (the upper Yangtze River).

FIGURE 7. Ƒanmanenia striata, SWFC 0605031, 66.2 mm SL; Yunnan: Yuanjiang County: Yinyuan. Scale bar = 5 mm.

Tables

TABLE 3. Morphometric data for Vanmanenia striata and Vanmanenia tetraloba.

	Ƒanmanenia striata (113)				Ƒanmanenia tetraloba (105)
	Min.	Max.	Mean	SD	Min.	Max.	Mean	SD
Standard length (mm)	42.1	83.1	63.8	9.94	41.5	80.6	64.3	6.82
Head length (mm)	9.6	20.0	15.3	2.48	10.0	20.0	15.8	1.76
Head depth (mm)	5.5	10.0	8.1	1.15	5.5	10.9	8.6	0.95
Head width (mm)	7.8	15.4	11.8	1.86	8.0	15.7	12.4	1.36
% of standard length
Body depth	17.1	18.9	18.4	0.35	20.0	22.3	20.6	0.61
Head length	22.1	24.9	23.9	0.60	24.0	25.4	24.5	0.45
Head depth	12.0	13.9	12.7	0.56	13.0	13.9	13.4	0.27
Head width	18.0	18.9	18.5	0.28	19.0	19.9	19.3	0.28
Dorsal-fin length	23.0	24.9	24.3	0.45	26.0	27.8	26.6	0.41
Pectoral-fin length	30.0	33.2	31.1	0.75	27.1	29.1	28.4	0.50
Pelvic-fin length	24.0	26.0	24.6	0.43	20.2	22.9	22.1	0.62
Anal-fin length	20.0	21.5	20.5	0.36	19.0	20.4	19.5	0.33
Length of caudal peduncle	10.1	11.9	11.1	0.51	10.0	11.9	11.0	0.51
Depth of caudal peduncle	8.1	8.9	8.5	0.24	9.0	9.9	9.3	0.21
Predorsal length	50.0	53.7	51.5	0.92	50.0	53.9	51.9	1.16
Prepectoral length	20.0	22.9	20.9	0.67	20.0	22.3	20.7	0.60
Prepelvic length	50.0	56.3	53.0	1.58	54.0	56.9	55.1	0.85
Preanal length	80.0	85.4	81.6	1.41	76.3	79.9	78.6	0.71
% of head length
Snout length	60.4	68.6	64.2	2.00	55.8	64.8	59.4	1.76
Head depth	48.1	60.0	53.0	2.98	51.5	57.7	54.5	1.07
Eye diameter	10.4	15.0	12.9	1.04	10.3	15.7	13.0	1.36
Interorbital width	40.1	48.2	43.4	1.66	40.0	47.1	42.6	1.48
% of caudal peduncle length
Depth of caudal peduncle	69.6	86.9	76.7	4.42	77.0	95.2	84.4	4.07
% distance from pelvic-fin origin to anal-fin origin
Distance from anus to anal-fin origin	50.0	60.3	52.7	2.23	40.0	48.6	43.4	2.46
% of body depth
Head depth	63.6	76.5	68.9	3.19	61.0	68.2	64.9	1.42