한국 남해에서 채집된 둥글넙치과(가자미목) 1미기록종, Crossorhombus azureus 후기자어의 형태기재 및 분자동정
Morphological description and molecular identification of the newly recorded bothid, Crossorhombus azureus (Bothidae, Pleuronectiformes) postlarva collected from the southern sea of Korea
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2019년 12월 한국 남해안에서 봉고네트로 둥글넙치과 어류 Crossorhombus azureus 후기자어 1개체가 채집되었다. 이 종은 요골후방돌기에 가시를 가지는 것을 특징으로 한다. 이 가시들은 말단부로 갈수록 작아지는 경향을 보인다. 흑색소포는 무안측의 등지느러미와 뒷지느러미의 기저에 분포하는데, 이는 후기자어기에 본종과 동속의 다른 종들을 구분하는데 유용한 식별 키로 간주된다. 미토콘드리아 DNA 기반으로 한 분자분석은 우리 표본이 C. azureus 성어와 잘 일치하는 결과를 보여주었다. 따라서, 우리는 본 연구에서 C. azureus 후기자어의 국내 출현을 처음으로 보고하며 본종의 신국명으로 “파랑둥글넙치”를 제안한다.
Abstract
A single postlarva (9.72 mm in standard length) specimen of Crossorhombus azureus (Alcock, 1889) belonging to the family Bothidae, was collected using a bongo net from the southern sea of Korea on December 10, 2019. This species is characterized by having spines on post basipterygial processes. It has two eyes located at the opposite side in head, which accordingly belongs to pre-metamorphosis stage. Melanophores are distributed on the dorsal and anal fin base on the right side (blind side), which is regarded as a useful identification key distinguishing C. azureus from congeneric species in their postlarval stage. A molecular analysis based on mitochondrial DNA COI sequences showed that our specimen was closely matched to adult C. azureus (K2P distance = 0.017). As there is no Korean name for the genus Crossorhombus in spite of presence of Crossorhombus kobensis and its Korean name “Go-be-dung-geul-neob-chi” in Korea, we proposed a new Korean name “Dung-geul-neob-chi-sog” for the genus Crossorhombus and “Pa-lang-dung-geul-neob-chi” for the species C. azureus.
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