GYMNOCRANIUS OBLONGUS - (BORSA, BEAREZ & CHEN, 2010)
Picture courtesy of : Gloup Noumea
Actinopteri (Class) > Perciformes (Order) > Percoidei (Suborder) > Lethrinidae (Family) > Gymnocranius (Genus)
Bossu blanc à nageoires roses,
Gymnocranius oblongus est décrit comme nouvelle espèce de la sous-famille des Monotaxinae (Sparoidea : Lethrinidae), un groupe de poissons d’importance commerciale distribué dans tout l’Indopacifique Ouest, à partir de six spécimens récoltés en Nouvelle-Calédonie. Il se caractérise par un corps oblong et fusiforme, un museau légèrement arrondi, une queue allongée aux extrémités arrondies, des lignes ou des tirets bleus sub-horizontaux et sinueux sur le museau et les joues. Il se distingue de l’espèce sympatrique Gymnocranius grandoculis par un corps plus allongé et plus symétrique dorso-ventralement et une nageoire caudale plus allongée. Les marqueurs mitochondriaux et nucléaires confirment la distinction des deux espèces.
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Gymnocranius oblongus is described as a new species of the subfamily Monotaxinae (Sparoidea: Lethrinidae), a group of commercially important fishes distributed throughout the Indo-West Pacific, from six specimens collected in New Caledonia. It is characterized by an oblong, fusiform body, slightly rounded snout, elongate tail with rounded tips and sub-horizontal, wavy blue lines or dashes on snout and cheeks. It is distinct from sympatric Gymnocranius grandoculis by a more slender body which is also more symmetrical dorso-ventrally and a more elongated caudal fin. Both mitochondrial-DNA and nuclear-DNA markers provide a genetic basis to the distinction of Gymnocranius oblongus from Gymnocranius grandoculis.
Description
A species of Lethrinidae with the following combination of characters: four rows of scales on cheek; 10 soft rays in dorsal fin; ten soft rays in anal fin; body oblong (hence the species epithet) and fusiform, ratio of standard length to body depth between 2.6 and 2.8, increasing with size; dorsal and ventral profiles almost similarly convex; tip of snout only slightly below axis of body; snout slightly rounded; tail elongated with rounded tips; posterior part of jaws reaching to about level of nostril; pored scales on lateral line: 48; scales between middle portion of spinous dorsal fin and lateral line: six. Lower edge of eye slightly (in the smaller individuals examined) to well above a line from tip of snout to middle of caudal fin fork; horizontal or sub-horizontal wavy blue lines or dashes on lower part of snout and on cheeks; pale blue speckles more or less visible on operculum. The lines or dashes become dark red or brown against paler background in preserved specimens; they do not extend up to the upper part of snout and their number slightly increases with size. Forehead, snout and upper lip of fresh specimens can be bright yellow, matched by similar yellow colouration of margin of operculum; loosely defined vertical dark bar crossing the eye; on fresh animals, dorsal, pectoral, anal and caudal fins drab, brownish or yellowish, with reddish to vermilion edges. Each lower jaw has a raw of three small, slender canines on each side of one large canine at front, and a lateral row of eight to 10 conical teeth; numerous villiform teeth form a brush behind the front canines; each upper jaw has a front row of six to 10 small, slender canines followed by four to five conical teeth and a patch of villiform teeth. Max length : 35.8 cm.
Etymology
Gymnocranius: Greek, gymnos = naked + Greek, kranion = skull.
oblongus: from Latin = somewhat long, oblong.
Distribution
Pacific Ocean: New Caledonia.
Biology
Has often been confused with Gymnocranius griseus (Temminck & Schlegel, 1843)
Actinopteri (Class) > Perciformes (Order) > Percoidei (Suborder) > Lethrinidae (Family) > Gymnocranius (Genus)
Bossu blanc à nageoires roses,
Gymnocranius oblongus est décrit comme nouvelle espèce de la sous-famille des Monotaxinae (Sparoidea : Lethrinidae), un groupe de poissons d’importance commerciale distribué dans tout l’Indopacifique Ouest, à partir de six spécimens récoltés en Nouvelle-Calédonie. Il se caractérise par un corps oblong et fusiforme, un museau légèrement arrondi, une queue allongée aux extrémités arrondies, des lignes ou des tirets bleus sub-horizontaux et sinueux sur le museau et les joues. Il se distingue de l’espèce sympatrique Gymnocranius grandoculis par un corps plus allongé et plus symétrique dorso-ventralement et une nageoire caudale plus allongée. Les marqueurs mitochondriaux et nucléaires confirment la distinction des deux espèces.
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Gymnocranius oblongus is described as a new species of the subfamily Monotaxinae (Sparoidea: Lethrinidae), a group of commercially important fishes distributed throughout the Indo-West Pacific, from six specimens collected in New Caledonia. It is characterized by an oblong, fusiform body, slightly rounded snout, elongate tail with rounded tips and sub-horizontal, wavy blue lines or dashes on snout and cheeks. It is distinct from sympatric Gymnocranius grandoculis by a more slender body which is also more symmetrical dorso-ventrally and a more elongated caudal fin. Both mitochondrial-DNA and nuclear-DNA markers provide a genetic basis to the distinction of Gymnocranius oblongus from Gymnocranius grandoculis.
Description
A species of Lethrinidae with the following combination of characters: four rows of scales on cheek; 10 soft rays in dorsal fin; ten soft rays in anal fin; body oblong (hence the species epithet) and fusiform, ratio of standard length to body depth between 2.6 and 2.8, increasing with size; dorsal and ventral profiles almost similarly convex; tip of snout only slightly below axis of body; snout slightly rounded; tail elongated with rounded tips; posterior part of jaws reaching to about level of nostril; pored scales on lateral line: 48; scales between middle portion of spinous dorsal fin and lateral line: six. Lower edge of eye slightly (in the smaller individuals examined) to well above a line from tip of snout to middle of caudal fin fork; horizontal or sub-horizontal wavy blue lines or dashes on lower part of snout and on cheeks; pale blue speckles more or less visible on operculum. The lines or dashes become dark red or brown against paler background in preserved specimens; they do not extend up to the upper part of snout and their number slightly increases with size. Forehead, snout and upper lip of fresh specimens can be bright yellow, matched by similar yellow colouration of margin of operculum; loosely defined vertical dark bar crossing the eye; on fresh animals, dorsal, pectoral, anal and caudal fins drab, brownish or yellowish, with reddish to vermilion edges. Each lower jaw has a raw of three small, slender canines on each side of one large canine at front, and a lateral row of eight to 10 conical teeth; numerous villiform teeth form a brush behind the front canines; each upper jaw has a front row of six to 10 small, slender canines followed by four to five conical teeth and a patch of villiform teeth. Max length : 35.8 cm.
Etymology
Gymnocranius: Greek, gymnos = naked + Greek, kranion = skull.
oblongus: from Latin = somewhat long, oblong.
Distribution
Pacific Ocean: New Caledonia.
Biology
Has often been confused with Gymnocranius griseus (Temminck & Schlegel, 1843)