한국산 색가오리과(Dasyatidae) 어류 1미기록종, Hemitrygon izuensis (Nishida and Nakaya, 1988)
First reliable record of a stingray, Hemitrygon izuensis (Nishida and Nakaya, 1988) (Chondrichthyes: Dasyatidae) from Korea
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매가오리목 색가오리과에 속하는 Hemitrygon izuensis 2개체(체반폭 395.8~471.5 mm)가 2016년 6월 및 2019년 8월에 각각 제주도 북동부 및 포항 해역에서 채집되었다. 본 종은 체반 등쪽에 반점이 없는 점, 꼬리 배쪽 피습이 흰색을 띠는 점, 그리고 눈 앞까지의 주둥이길이가 짧은(체반폭의 15.6~18.3 %) 외부형태적 특징을 지닌다. 본 종은 한국에 분포하는 노랑가오리(H. akajei) 및 갈색가오리(H. sinensis)와 외부형태가 매우 유사하나, 체반 등쪽 중앙선에 분포하는 소극(H. izuensis는 없음 vs. 노랑가오리, 갈색가오리는 있음), 꼬리 배쪽 피습의 길이(H. izuensis는 체반폭의 28.1~31.0 % vs. 노랑가오리는 48.0~48.6 %, 갈색가오리는 45 %), 꼬리 배쪽 피습의 색상(H. izuensis는 흰색 vs. 노랑가오리, 갈색가오리는 검은 색), 그리고 꼬리 후반부의 결절(H. izuensis는 없음 vs. 노랑가오리, 갈색가오리는 있음)에서 구분된다. 본 종의 국명으로 Kim et al. (2019)을 따라 “이주갈색가오리”를 제안한다.
Abstract
Two specimens of Hemitrygon izuensis (395.8-471.5 mm in disc width), belonging to the family Dasyatidae (Myliobatiformes), were collected from the waters off north-eastern Jeju-do Island in June 2016 and Pohang in August 2019. This species was characterized by having no spots on dorsal side of disc, white ventral tail fold and short preorbital snout length (15.6-18.3% of disc width). This species is similar to H. akajei and H. sinensis reported in Korea, but differs in small denticles on mid-line of dorsal surface of disc (absent in H. izuensis vs. present in H. akajei and H. sinensis), the length of ventral tail fold (28.1-31.0% in H. izuensis vs. 48.0-48.6% in H. akajei vs. 45.0% in H. sinensis), color of ventral tail fold (white in H. izuensis vs. black in H. akajei and H. sinensis) and small tubercles on the posterior part of tail (absent in H. izuensis vs. present in H. akajei and H. sinensis). We suggest a Korean name for H. izuensis as “I-ju-gal-saeg-ga-o-li” following Kim et al. (2019).
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