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남서대서양에서 채집된 Bathyraja brachyurops (Rajiformes: Arhynchobatidae) 기형의 첫 보고
박민균 ( Min-gyoon Park ),김은정 ( Eunjung Kim ),김진구 ( Jin-koo Kim ) 한국수산과학회 2023 한국수산과학회지 Vol.56 No.6
An abnormal shape of Bathyraja brachyurops was first reported from the catch of a bottom trawl in the southwest Atlantic Ocean in June 2022. Both pectoral fins of the specimen did not fuse with the head, resulting in a horn-like structure separated from the sides of the eyes. Analysis of mitochondrial DNA cytochrome c oxidase subunit I se quences showed that our specimen was perfectly matched to Bathyraja brachyurops registered with the National Cen ter for Biotechnology Information. Our specimen possessed the following morphological features: a pair of flexible but elongated and pointed horns on the head; rough dorsal disc, densely covered with numerous small denticles on the head, anterior margin of pectoral fins and median line of the disc; a thorn between the first and second dorsal fins; and a pair of large ocelli at the base of pectoral fins. Unlike the normal B. brachyurops, our specimen had a slender clasper and no nuchal thorns, which may be related to the morphological abnormality. The horn-like structure on the head may be owing to the lack of fusion between the pectoral fins and head during early embryonic development.
ScienceON
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