한국 제주도에서 채집된 학공치과 어류, Oxyporhamphus micropterus 첫 기록
First Record of the Bigwing Halfbeak Oxyporhamphus micropterus (Teleostei: Hemiramphidae) collected from Jeju-do Island, Korea
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A single individual (125.86 mm in standard length) of Oxyporhamphus micropterus, a hemiramphid fish species previously unreported in Korea, was firstly collected for the first time from Jeju-do Island, in September 2014. This species is characterized by following morphological features: Pectoral fins elongate, nearly reaching the origins of the pelvic fins; pelvic fins short and transparent with slightly dark margin; upper jaw short, without a pointed projection; and lower jaw short, slightly longer than upper jaw. O. micropterus can be distinguished from its congener Oxyporhamphus similis, by having 32 predorsal scales (30 in O. similis), 30 gill rakers on the first arch (32 in O. similis) and by the elongated lower jaw in young halfbeak stage at 90–100 mm SL (at 60 mm SL in O. similis). The species resembles Hemiramphus convexus, but differs in having the pelvic fins positioned farther forward (farther backward in H. convexus). Morphological identification result was well supported molecular analysis result based on mitochondrial DNA cytochrome b sequences. Therefore, we add this species to the Korean fish fauna, and propose the new Korean names “Nal-gong-chi-sog” for the genus Oxyporhamphus and “Nal-gong-chi” for the species O. micropterus.
Abstract
A single individual (125.86 mm in standard length) of Oxyporhamphus micropterus, a hemiramphid fish species previously unreported in Korea, was firstly collected for the first time from Jeju-do Island, in September 2014. This species is characterized by following morphological features: Pectoral fins elongate, nearly reaching the origins of the pelvic fins; pelvic fins short and transparent with slightly dark margin; upper jaw short, without a pointed projection; and lower jaw short, slightly longer than upper jaw. O. micropterus can be distinguished from its congener Oxyporhamphus similis, by having 32 predorsal scales (30 in O. similis), 30 gill rakers on the first arch (32 in O. similis) and by the elongated lower jaw in young halfbeak stage at 90–100 mm SL (at 60 mm SL in O. similis). The species resembles Hemiramphus convexus, but differs in having the pelvic fins positioned farther forward (farther backward in H. convexus). Morphological identification result was well supported molecular analysis result based on mitochondrial DNA cytochrome b sequences. Therefore, we add this species to the Korean fish fauna, and propose the new Korean names “Nal-gong-chi-sog” for the genus Oxyporhamphus and “Nal-gong-chi” for the species O. micropterus.