Wide-mouthed flounder

description

DESCRIPTION Body oblong, somewhat elongate, greatest depth 35.4 - 38.7 % SL. Head relatively short, 18.9 - 19.9 % SL. Mouth extremely large; jaws elongate; maxilla extending beyond dorsal contour of snout; tip of vomer protruding well into mouth cavity (Fig. 3). Teeth arranged in a single series; three pairs of enlarged teeth on anterior tip of lower jaw, greater than twice the length of adjacent teeth in lower jaw; all teeth in lower jaw curved backwards. Teeth in upper jaw significantly shorter than those in lower jaw and more numerous, villiform tooth-band on posterior half; three to four pairs of enlarge teeth on anterior tip of upper jaw, greater than twice the length of adjacent teeth in upper jaw; all teeth in upper jaw conical (Fig. 3 C). Eyes of moderate size, upper eye slightly larger than lower eye (25.2 - 33.4 % HL vs 23.2 - 30.7 % HL); situated at the same level and close together with a short interorbital width of 3.6 - 5.0 % HL. Lateral line on ocular side running from uppermost opercular opening to caudal peduncle, with small curve above base of pectoral fin; 114 - 131 pored lateral line scales. Lateral line absent on blind side. Dorsal fin originating above snout,

First record of the rare Wide-mouth flounder Kamoharaia megastoma (Kamohara, 1936) (Pleuronectiformes, Bothidae) from the western Indian Ocean collected during the ATIMO VATAE expedition to Madagascar “ Deep South ”

materials_examined

MATERIAL EXAMINED. — Madagascar • 1 specimen; MNHN- IC- 2019 - 0265 (formerly SAIAB 189569); 102.37 mm SL; Sud Pointe Barrow, Madagascar, southwestern Indian Ocean; 25 ° 33 ’ S, 44 ° 18 ’ E; 155 - 156 m depth; 10. V. 2010; B. de Forges, S. Rafamatanantsoa and E. Ranaivoson leg.; ATIMO VATAE; FV Nosy Bé 11 • 1 specimen; SAIAB 189569; 99.65 mm; same data as preceding • 1 specimen; SAIAB 189603; 108.72 mm SL; Sud-Ouest Pointe Barrow, Madagascar, southwestern Indian Ocean; 25 ° 02 ’ S, 43 ° 59 ’ E; 300 - 309 m depth; 11. V. 2010; B. de Forges, S. Rafamatanantsoa and E. Ranaivoson leg.; ATIMO VATAE; FV Nosy Bé 11 • 1 specimen; SAIAB 189783; 131.16 mm SL; Sud Pointe Barrow, Madagascar, southwestern Indian Ocean; 25 ° 33 ’ S, 44 ° 16 ’ E; 549 - 576 m depth; 10. V. 2010; B. de Forges, S. Rafamatanantsoa and E. Ranaivoson leg.; ATIMO VATAE; FV Nosy Bé 11.

First record of the rare Wide-mouth flounder Kamoharaia megastoma (Kamohara, 1936) (Pleuronectiformes, Bothidae) from the western Indian Ocean collected during the ATIMO VATAE expedition to Madagascar “ Deep South ”

vernacular_names

COMMON NAMES. — Wide-mouthed flounder, Wani-garei (Japanese), keun-ip-dung-geul-neop-chi-sok (Korean).

First record of the rare Wide-mouth flounder Kamoharaia megastoma (Kamohara, 1936) (Pleuronectiformes, Bothidae) from the western Indian Ocean collected during the ATIMO VATAE expedition to Madagascar “ Deep South ”

description

Specimens examined. NMMB-P 17856 (1, 186.6), Nan-fang-ao, 13 Oct. 2012; NMMB-P 21088 (1, 109), Donggang, 30 Mar. 2014; NMMB-P 22267 (1, 164.2), Dong-gang, 7 Nov. 2013; NMMB-P 25330 (1, 95.0), Dong-gang, 26 May 2013; NMMB-P 29037 (1, 95.4), Ke-tzu-liao, 18 Mar. 2018. More specimens deposited in NMMB-P. Diagnostic features. D 109 – 112; A 84 – 88; P 12; C 3 – 5 + 7 – 11 – 5 = 17; LLs 126 – 132; GR 0 – 3 + 7 – 8; vert. 13 + 39 – 40 = 52 – 53. Body elliptical, strongly compressed; greatest depth near tip of pectoral fin (34.1 – 38.3 % SL). Caudal peduncle narrow, its depth 5.1 – 5.7 % SL. Head small, its length 17.1 – 20.1 % SL; upper profile of head deeply concave anterior of interorbital area, and more or less convex in front of upper eye. Snout much shorter than eye diameter. Eyes small, about 1 / 3 of upper jaw, separated by narrow flat ridge. Mouth very large, upper-jaw length about 14.5 – 19.2 % SL; maxilla extending well beyond posterior margin of lower eye; tip of upper jaw protruding beyond tip of snout by half eye diameter. Teeth on upper jaw uniserial, 3 or 4 pairs of larger teeth anteriorly, narrow tooth band on posterior half; lower jaw teeth uniserial, anteriorly 3 pairs

The lefteye flounder family Bothidae (Order Pleuronectiformes) of Taiwan