Journal of Species Research

The National Institute of Biological Resources (국립생물자원관)
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New record of the unstalked crinoid Tropiometra macrodiscus (Crinoidea: Comatulida: Tropiometridae) from Korea

  • Kim, Philjae (Division of Ecological Conservation, Bureau of Ecological Research, National Institute of Ecology) ;
  • Lee, Taekjun (Department of Animal Biotechnology & Resource, Sahmyook University) ;
  • Shin, Sook (Department of Animal Biotechnology & Resource, Sahmyook University)
  • Received : 2021.10.20
  • Accepted : 2021.12.15
  • Published : 2022.02.28
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Abstract

Two crinoid specimens of genus Tropiometra were collected from Busan and Tongyeong by SCUBA diving on August 2010 and October 2011, respectively. The specimens were identified as Tropiometra macrodiscus (Hara, 1895), which belongs to the family Tropiometridae of superfamily Tropiometroidea. The genus Tropiometra AH Clark, 1907 comprises four species worldwide at present, and it has not been reported in Korea. Tropiometra macrodiscus was first described by Hara (1895) in Japan. It is difficult to distinguish T. macrodiscus from T. afra (Hartlaub, 1890), there has been confusion with examination of their phylogenetic positions in crinoid morphological classification. Despite this, T. macrodiscus can be distinguished from T. afra based on longer arms, stouter whole-body parts, magnificently larger numbers of cirrus, and numerous segments. The morphological characteristics of T. macrodiscus collected in Korea have been described, and DNA barcode region representing cytochrome c oxidase subunit I was obtained for its molecular phylogenetic analysis.

Keywords

Acknowledgement

This study was supported by a grant from the National Institute of Biological Resources(NIBR), which was funded by the Ministry of Environment (MOE) of the Republic of Korea (NIBR 202102203), and the project titled "Improvement of management strategies on marine disturbing and harmful organisms (No. 20190518)" funded by the Ministry of Oceans and Fisheries, Korea.

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