Animal Systematics, Evolution and Diversity

The Korean Society of Systematic Zoology (한국동물분류학회)
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Two New Records of Eudistoma (Aplousobranchia: Polycitoridae) from Korea

  • Su Yuan Seo (Natural History Museum, Ewha Womans University)
  • Received : 2023.12.12
  • Accepted : 2024.01.09
  • Published : 2024.01.31
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Abstract

Two colonial ascidians, Eudistoma glaucum and Eudistoma purpureum, are reported for the first time in Korean waters through taxonomic study on ascidians collected from a subtidal zone of Jejudo Island. Eudistoma glaucum is distinguished by opaque green color of colony in living, massive colony with large corona, smooth surface of corona, sparse sand only at the peduncle, zooids in circle, about 8-10 stigmata of 3 stigmata rows and test process. Eudistoma purpureum is distinguished by brilliant, opaque, purple color of colony in living, less lobed colony form, smooth shiny surface, sparse sand only at the basal test, absence of symbionts, zooids in circle, no distinct bulging sphincter in siphon, long atrial siphon and about 20 stigmata of 3 stigmata rows. As a result of this study, four species of the genus Eudistoma are now recorded in Korean fauna.

Keywords

Acknowledgement

I thank Seung-Hwan Park (H Dive Company) for collecting and taking pictures of ascidians underwater. This work was supported by the management of Marine Fishery Bio-resources Center (2023) funded by the National Marine Biodiversity Institute of Korea (MABIK), 2023M00200 and the Natural History Museum of Ewha Womans University in part.

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