Tor dongnaiensis Hoàng, Ạm, Durand, Ần & Phan, 2015, sp. nov.
Creators: name: Hoàng, Ức
name: Ạm, Ạnh Ph
name: Durand, Jean-Dominique
name: Ần, Ngân Tr Ọng Tr
name: Phan, Phúc Đình
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Cypriniformes
Cyprinidae
Tor
Tor dongnaiensis

description: Tor dongnaiensis sp. nov.
Holotype: UNS 00859, 240 mm SL; middle Đồng Nai drainage: Cát Tiên National Park, Lâm Đồng Province, Vietnam (11°26’33.32” N 107°26’4.01” E, 162 m), 7 March 2014, Hoàng Đức Huy, Ph ạm Mạnh Hùng and Tr ần Tr ọng Ngân (Fig. 2).
Paratypes (all same locality as holotype): ZRC 54628, 114 mm SL, 11 March 2014; UNS 00861, 167 mm SL, 12 March 2014; UNS 00862, 201 mm SL, 9 April 2014; ZRC 54627, 243 mm SL, 26 October 2013; UNS 00880, 167 mm SL, 1 June 2014; UNS 00888, 189 mm SL, 23 October 2014; UNS 00889, 411 mm SL, 23 October 2014 (11°39’20.8” N 107°16’04.7” E, 195 m).
Diagnosis. Tor dongnaiensis most closely resembles T. tambroides but differs in having a yellow to grey vs. silver-bronze and reddish body, transverse scale rows 4/1/2 vs. 3/1/2, predorsal scales 10 vs. 8-9, pelvic-fin rays 1/ 8 vs. 2/8, median projection in upper lip absent vs. present, and caudal fin lobes unequal vs. equal. Tor dongnaiensis differs from T. ater in having lateral scales 23–24 vs. 30–31, transverse scale rows 4/1/2 vs. 5/1/2, predorsal scales 10 vs. 11–12, median lobe in lower lip long vs. short, stripe along side of body absent vs. present. Tor dongnaiensis differs from T. laterivittatus and T. sinensis in having transverse scale rows 4/1/2 vs. 3–4/1/2, stripe along side of body absent vs. present. Tor dongnaiensis differs from T. yingjiangensis in having deeper body 28.3–33.6 vs. 25.5–27.3% SL, caudal peduncle length 18.4–22.3 vs. 11.3–14.8% SL, and median lobe in lower lip long vs. short. Tor dongnaiensis differs from T. tambra in having transverse scale rows 4/1/2 vs. 3/1/2, predorsal scales 10 vs. 8–9, lips thickened vs. normal, and median lobe in lower lip long vs. short.
Description. General appearance in Figure 3; meristic and morphometric data of specimens given in Table 3. Head conical, longer than deep, its depth 1.3–1.5 times in HL. Snout slightly pointed. Mouth subterminal and oblique, its posterior edge not extending to vertical line of orbit. Rostral hood straight and pointed. Lips thick fleshy; upper lip rolled backwards and upwards without median projection; median lobe of lower lip long, more or less square and reaching an imaginary line between the corners of the mouth (Fig. 4 e, f). Rostral and maxillary barbels almost equal in length and both longer than eye diameter.
Body elongate, moderately compressed, its depth about 3.0–3.5 times in SL; caudal peduncle about 1.5–1.8 times longer than deep. Dorsal body profile convex, ventral profile rounded. Lateral line complete, 23–24 scales; 10 predorsal scales; 4/1/2 scales in transverse row anterior to pelvic-fin insertion.
Tor dongnaiensis Tor mekongensis Dorsal with 4 simple and 9 branched rays, last simple ray smooth; dorsal-fin origin inserted approximately opposite to pelvic-fin origin; distal margin slightly concave. Pectoral fin pointed with 1 simple and 16 branched rays. Pelvic fin pointed, with 1 simple and 8 branched rays; axillary scale present. Anus immediately in front of anal fin. Anal fin pointed with 3 simple and 6 branched rays. Caudal deeply forked with 10+9 principal rays, 9+8 being branched and upper lobe smaller than lower one.
Colour in life. Head dark yellowish turquoise on back, yellowish turquoise around orbit and on side, white on opercula and lower jaw. Body dark grey on back, light yellow above lateral line, grey white on belly. Scales light yellow to silver white, black at scale bases. All fins dark grey with yellow tinge on the branched rays. In sub-adult specimens, scales and fins light yellow but pectoral fin and pelvic fin pinkish orange on coastal rays. In juvenile specimens, scales bluish silver; dorsal and caudal fins greenish yellow, dark bold on rays; pectoral fins pinkish orange; pelvic and anal fins yellow with orange at coastal rays and hyaline on distal parts (Fig. 3 a, b, c).
Colour in preservative. Body including head dark grey on back. Opercula becoming black at base. Lower half of body greyish white. All fins grey to dark grey (Fig. 3 d).
Etymology. Specific epithet is in reference to the type locality of Đồng Nai drainage.
Suggested common name. Cá ngựa xám Đồng Nai (Vietnamese), Dongnai mahseer (English).
description: Published as part of Hoàng, Ức, Ạm, Ạnh Ph, Durand, Jean-Dominique, Ần, Ngân Tr Ọng Tr & Phan, Phúc Đình, 2015, Mahseers genera To r and Neolissochilus (Teleostei: Cyprinidae) from southern Vietnam, pp. 551-568 in Zootaxa 4006 (3) on pages 556-560, DOI: 10.11646/zootaxa.4006.3.8, http://zenodo.org/record/246039