Cobitis gracilis, Chen & Chen, 2016

Chen, Yongxia & Chen, Yifeng, 2016, A new species of the genus Cobitis (Cypriniformes: Cobitidae) from the Northeast China, Zoological Systematics 41 (4), pp. 379-391 : 381-385

publication ID

https://doi.org/ 10.11865/zs.201643

publication LSID

lsid:zoobank.org:pub:DE55A687-38EB-4F67-AD2A-F535E3D659AA

DOI

https://doi.org/10.5281/zenodo.4617610

persistent identifier

https://treatment.plazi.org/id/03AD87C9-4D31-FF91-91B2-FABB163DC362

treatment provided by

Carolina

scientific name

Cobitis gracilis
status

sp. nov.

Cobitis gracilis sp. nov. ( Figs 3–12 View Figures 3–8 View Figures 9–12 )

Holotype. ♂, HU 1600062, 74.4 mm TL, 64.2 mm SL, the Yalu River , Linjiang (41°81′N, 126°92′E), Jilin, China, October 2015, collected from the Linjiang farm product market by Yongxia Chen.

Paratypes. HU 1505136, 1600037, 1600056, 3♀, 75.2–88.4 mm TL, 65.0– 78.4 mm SL, same data as holotype; HU 1506359, 1506347, 1506354, 3♀, 81.5–86.4 mm TL, 71.0– 74.3 mm SL, the Ussuri River , Raohe (46°80′N, 134°02′E), Heilongjiang, China, October 2015, collected from the Raohe farm product market by Yongxia Chen .

Diagnosis. The new species is most similar to C. granoei and C. melanoleuca , but distinguished from C. granoei and C. melanoleuca in the upper jet black spot at the base of caudal fin inconspicuous or absent ( Figs 3–4 View Figures 3–8 , 9–10 View Figures 9–12 ) (vs. jet black spot conspicuous in C. melanoleuca ( Figs 19–20 View Figures 19–24 ) and C. granoei ( Figs 13–14 View Figures 13–18 )); suborbital spine is slender and straight, with long processus latero-caudalis, less than one-second of the processus medio-caudalis ( Fig. 7 View Figures 3–8 ) (vs. suborbital spine thick and straight with short processus latero-caudalis in C. melanoleuca ( Fig. 23 View Figures 19–24 ); suborbital spine slender and curved with long processus latero-caudalis in C. granoei ( Fig. 17 View Figures 13–18 )); males with a small meniscus lamina circularis at the base of the first branched pectoral fin ray ( Fig. 5 View Figures 3–8 ) (vs. an knife lamina circularis in C. melanoleuca ( Fig. 21 View Figures 19–24 ); a larger semilunar lamina circularis in C. granoei ( Fig. 15 View Figures 13–18 )); 15–20 blotches on L 5 (vs. 10–16 blotches on L 5 in C. melanoleuca ; 11–16 large blotches on L 5 in C. granoei ).

Description. General appearance and morphometic data of holotype and paratypes are given in Figs 3–12 View Figures 3–8 View Figures 9–12 and Table 2 View Table 2 , respectively. D. III–7; A. III–5; V. I–6; P. I–7–8; C. IV–14–16–IV. Body slender, depth 8.7 in SL in males and 8.9–11.1 (mean 9.8) in females. Head small, with a length of 5.3 in SL in males and 5.2–5.6 (mean 5.5) in females. Snout rounded. Preorbital part of head shorter than postorbital part of head. Mouth small, with three pairs of short barbels. Length of maxillo-mandibular barbels shorter than diameter of eye. Maxillary barbels not reach under anterior border of eye. Mental lobes undeveloped, two superficial longitudinal lobes short, and lower tip bluntly rounded ( Fig. 6 View Figures 3–8 ). Suborbital spine slender and straight, with long processus latero-caudalis, less than one-second of processus medio-caudalis ( Fig. 7 View Figures 3–8 ). Subdorsal scales small and oval, with a large focal area, 19–22 radial grooves, and 3–5 supplementary ones ( Fig. 8 View Figures 3–8 ).

Dorsal fin inserted midway between posterior nasal and base of caudal fin. Length of predorsal 1.9 in SL in males and 1.8–1.9 (mean 1.8) in females. In males, pectoral fins longer than those in females; first branched pectoral fin ray longest. Length of first branched pectoral fin ray 7.1 in SL. In females, second branched pectoral fin ray longest with length of second branched pectoral fin ray 8.6–11.0 (mean 9.8) in SL. Ventral fins approximately at same level as dorsal fin. Anal fin located in far behind dorsal extremity and not reach caudal fin. Anal orifice close to anal fin. Caudal fin emarginated tip.

Pigmentation pattern. Body color whitish with a variable dark brown pigmentation pattern organized in L 1 –L 5 ( Figs 3–4 View Figures 3–8 , 9–12 View Figures 9–12 ). Color patterns characteristic of sexual dimorphism not obvious. L 1 consisted of a row of 7–9 rectangular blotches before dorsal fin that became less regular behind head; 2 on dorsal fin and 7–10 behind dorsal fin. Gap of rectangular blotches narrower than width of blotches. L 2 comprised a line of irregularly small dots that not intermingle with gap of L 1, and diminished towards end of caudal fin. L 3 comprised a row of horizontally elongated or rounded spots and that decreased beyond anal fin. L 4 spotted with one line of dots and that diminished towards end of caudal fin. L 5 comprised 15–20 oval blotches that together formed an irregular small blotch near head and caudal fin. At base of caudal fin, one inconspicuous jet-black spot found in upper region. In a few individuals, spot absent. Five or six striations on dorsal and caudal fins. Head sprinkled with many black spots on dorsal side, and a black stripe extended from occiput through eye to insertion of rostral barbels.

Sexual dimorphism. Males smaller than females with proportionally longer pectoral, ventral, and anal fins. In males, first branched pectoral-fin ray thickened and elongated, with a small meniscus lamina circularis at base ( Fig. 5 View Figures 3–8 ). In females, second branched pectoral fin ray elongated.

Distribution. This new species occurs in the Yalu and Heilongjiang rivers in Jilin and Heilongjiang Provinces in northeast of China ( Figs 1–2 View Figure 1 View Figure 2 ).

Etymology. The specific name derives from the Latin gracilis , meaning slender, in reference to the slender body.

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Cypriniformes

Family

Cobitidae

Genus

Cobitis

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