Channa andrao, Britz, Ralf, 2013

Britz, Ralf, 2013, Channa andrao, a new species of dwarf snakehead from West Bengal, India (Teleostei: Channidae), Zootaxa 3731 (2), pp. 287-294 : 288-291

publication ID	https://doi.org/ 10.11646/zootaxa.3731.2.9
publication LSID	lsid:zoobank.org:pub:E17CEF13-F120-4C30-B60D-BD00431B748A
DOI	https://doi.org/10.5281/zenodo.5686411
persistent identifier	https://treatment.plazi.org/id/0397DB4D-2E27-3D63-FF49-FF25FCF1DC2B
treatment provided by	Plazi
scientific name	Channa andrao
status	sp. nov.

Treatment

Channa andrao View in CoL , new species

Figures 1 View FIGURE 1 , 2 View FIGURE 2 , 5 View FIGURE 5

Holotype. BMNH 2013.10.1.2, 98.2 mm SL; India: West Bengal: Jalpaiguri district: Lefraguri swamp, 26°31'N 89°50'E; Pradhan K. 28 April 2008.

Paratypes. BMNH 2013.10.1.3–11, 9, 82–100.3 mm SL; same data as holotype.

Diagnosis. Channa andrao is distinguished from all other species in the genus, except, C. asiatica (Linnaeus) ( Fig. 4 View FIGURE 4 ), C. bleheri Vierke ( Fig. 3 View FIGURE 3 ), C. burmanica Chaudhuri , the recently described C. hoaluensis Nguyen and C. ninhbinhensis Nguyen , and C. orientalis Bloch & Schneider by the absence of pelvic fins. It is distinguished from C. asiatica , C. hoaluensis , C. ninhbinhensis and C. burmanica by fewer vertebrae (41–43 vs. 45–57). It is further distinguished from C. asiatica , C. hoaluensis and C. ninhbinhensis by fewer dorsal- (35–36 vs. 46–49) and anal-fin rays (23–26 vs. 28–32), and fewer scales in the lateral line (42–43 vs. 55–64). It differs also from C. asiatica by fewer scales above (3.5 vs 5.5) and below the lateral line (5.5 vs. 11), fewer preanal scales (21–22 vs. 39), fewer pectoral-fin rays (14–15 vs. 16), fewer principal caudal rays (12–13 vs. 16) and by its reproductive behaviour (mouthbrooder vs. floating-egg guarder). The new species differs from Channa orientalis by a longer dorsal- (64.6–68.8 vs. 58.0–59.6 % SL), and anal-fin base (40.8–44.5 vs. 36.4–38.8 % SL), more lateral line scales (42–43 vs. 40–41), more vertebrae (41–43 vs. 38–40), more anal-fin rays (23–26 vs. 21–22) and the coloration of its pectoral fins (two to three basal pectoral-fin bands vs. five narrow pectoral-fin bands, see Fig. 5 View FIGURE 5 ). Channa andrao is most similar to C. bleheri (Figs. 3,5), but differs from it by a longer dorsal-fin base (64.6–68.8 vs. 59.7–63.7 % SL), absence (vs. presence) of whitish-cream (orange-red in life) blotches on the caudal fin, only two (vs. five) dark concentric bands in the pectoral fin (see Fig. 4 View FIGURE 4 ) and by its reproductive behaviour (mouthbrooder vs. floating-egg guarder).

Description. For general appearance see Figures 1–2 View FIGURE 1 View FIGURE 2 . Morphometric data are provided in Table 1 View TABLE 1 .

A member of the Channa gachua species group (sensu Britz 2008). Body elongate, round in cross section anteriorly, laterally compressed at caudal peduncle, body depth 5.7–6.6 times in SL. Head large, length 3.4–3.7 times in SL. Head widest halfway between posterior margin of eye and that of opercle. Mouth large, maxilla extending posteriorly beyond jaw angle, lips fleshy. Both jaws with multiple rows of sharp, pointed minute teeth, no canines. Vomer with small number of canine-like teeth only. Minute teeth on palatine.

Pectoral-fin rays 13–15. Dorsal-fin rays 35–36. Anal-fin rays 23–26. Caudal-fin rays (including procurrent rays): 1+6+6+2(1), 2+6+6+2 (5), 2+6+6+3(1), 3+6+6+3(1), 2+7+6+3(1), 2+6+7+1(1).

Predorsal scales 13(2)–14(8). Lateral line with 42(5)–43(5) scales extending from shoulder girdle in a horizontal line, but dropping one scale row at scale 13(4) or 14 (6), then continuing horizontally to caudal peduncle. Scales above lateral line 3.5 (10) and below 5.5 (10) at anal-fin origin. Vertebrae: 41–43.

Colour. In alcohol ( Fig. 1 View FIGURE 1 , 5 View FIGURE 5 ), dorsum and sides of head and body uniformly dark grey. Opercular area and jaws gray, becoming lighter towards throat, with whitish cream marbling spots. Branchiostegal membrane dark grey, isthmus cream. Belly cream, ventral area adjacent to anal fin with alternating whitish cream and grey oblique lines.

Pectoral fin with dark grey spot at fleshy base, more distally with two alternating creamish white and dark grey semi-circular bands, distal part of pectoral fin with dark grey fin rays alternating with whitish cream fin membranes ( Fig. 1 View FIGURE 1 , 5 View FIGURE 5 ). Dorsal, anal and caudal fins dark grey with narrow white rim.

In life ( Fig. 2 View FIGURE 2 ), body light grey, series of red spots on cheek and opercle continued on body by series of red marks arranged in oblique lines, most conspicuous on ventral half of side above anal-fin base, corresponding to whitish cream marks in preserved specimens. Dorsal and anal fin with bluish, sometimes greenish reflecting membranes, distal parts of dorsal and anal-fin rays dark grey, both fins with white rim. Caudal fin with bluish membranes, but dark-grey fin rays, rimmed with red and more distally with white.

Distribution. Known only from Lefraguri swamp, Jalpaiguri district, West Bengal, India ( Fig. 6 View FIGURE 6 ).

Etymology. The species name honours Andrew Rao, Malabar Tropicals, Calcutta, for his support of the ichthyological exploration of the freshwater fish fauna of India.

Remarks. This species was caught in a swamp with silty bottom in a forested area ( Fig. 6 View FIGURE 6 ). The shallow turbid water had pH 6.3, conductivity 72 µS·cm, water temperature 26.9°C, and there was an abundance of aquatic vegetation (recorded 11 July 2006 by A. Rao).

This species is known in the ornamental fish trade as Channa “blue bleheri ”, C. “Lal Cheng” or C. sp. “Assam”. It is a male mouthbrooder (Brede & Antler 2009).