本種はMcCann and McKnight(1980)によりニュージーランドで記載された。今回チリ パタゴニアから得られた標本はM. matamuaの記載と極めてよく一致するので,本報告はM. matamuaのチリ海域での初記録と考えられる。
(中村 泉)
Material examined:
8 from Chile (230.6-342.0 mm TL), FAKU CP 122, 123, 138-141. 525, 581.
Description:
D U, 9-10, ca. 125; A ca. 110; P1 17-20; P2 7; GR 9-11; Scales above LL 5; LLS till above anal origin 11-13;.
HL 73.5-74.8 % of PreA; BO 30.0-32.3; BD 44.1-49.5; SN 19.7-22.5; IO 12.7-15.3; UJ 23.1-25.2; D1H 42.8-49.9; P1L 44.1-49.0; P2L 22.8-27.2.
Body compressed and elongate with slightly depressed head. Head very large, 1.3 times in preanal length. Snout short and triangular in shape with pointed tip, well anterior to mouth, its length two-thirds of orbit diameter. Eye very large, 2.3-2.5 times in HL. Interorbital region slightly concave with two ridges extending from upper insertion of opercle, its width 2.3-2.4 times in orbit diameter. Minute barbel on chain. Posterior margin of opercle concave. Mouth inferior, protractile. Villiform teeth in bands on both jaws. No teeth on vomer or palatines. No pseudobranchiae. Gill-rakers nub-like. Ctenoid scales on head and body. Each scale with fine spines directing backward in 3-8 rows. First dorsal fin large, dusky in color, its origin above pectoral fin origin. Pectoral fin long, about equal to body depth at first dorsal fin origin. Pelvic fin rays 7, its origin slightly anterior to below pectoral fin origin, outer ray filamentous. Anal fin well developed and higher than dorsal fin, its longest ray equal to orbit diameter. Single lateral line running from upper insertion of opercle to caudal fin base gradually curving anteriorly, ending straight posteriorly. Luminescent organ present. Anus situated just anterior to anal fin origin. Area around belly, branchiostegal membrane, pelvic fin and anal fin very dark.
Distribution:
Chilean Patagonia; also known from New Zealand (McCann and McKnight, 1980), and South Africa (Iwamoto, in press).
Remarks:
This seems to be a new record of M. matamua for the Chilean ichthyofauna.