One new species and three records of cytheroid ostracods (Crustacea, Ostracoda) from Korea

  • Karanovic, Ivana (Department of Life Science, College of Natural Science, Hanyang University) ;
  • Yoo, Hyunsu (Department of Life Science, College of Natural Science, Hanyang University) ;
  • Tanaka, Hayato (Research Center for Marine Education, Ocean Alliance, The University of Tokyo) ;
  • Tsukagoshi, Akira (Department of Geoscience, Faculty of Science, Shizuoka University)
  • Received : 2017.08.16
  • Accepted : 2017.10.27
  • Published : 2017.12.28


This study describes a new species of cytheroid ostracod, Paradoxostoma koreana sp. nov., collected in Korea. In addition, three other cytheroid ostracods, P. setoense Schornikov, 1975, Loxoconcha pulchra Ishizaki, 1968, and Ishizakiella miurensis (Hanai, 1957), are reported with brief descriptions and images. Paradoxostoma setoense and L. pulchra were previously only known from Japan, while I. miurensis was previously reported from Korea. Here, we describe variability in hemipenis morphology observed in the Korean population. The new species is closely related to several East Asian species, but its sister species is P. rhomboideum Okubo, 1977. The primary difference between the new species and P. rhomboideum is morphology of the distal projections of the hemipenis, but minor differences exist in the details of the cheatotaxy of other appendages. This report also provides a list of all East Asian Paradoxostomatidae.


Supported by : National Institute of Biological Resources (NIBR)


  1. Brandao, S.-N., M.-V. Angel, M.V., I. Karanovic, V. Perrier and M. Yasuhara. 2017. World Ostracoda Database. Accessed through: World Register of Marine Species at id=155967 on 2017-06-16.
  2. Hanai, T. 1957. Studies on the Ostracoda from Japan I. Subfamily Leptocytherinae, new subfamily. Journal of the Faculty of Science, University of Tokyo 10:431-468.
  3. Hanai, T., N. Ikeya, K. Ishizaki, Y. Sekiguchi and M. Yajima. 1977. Checklist of Ostracoda from Japan and its adjacent seas. University of Tokyo, Bulletin 12:1-120.
  4. Hartmann, G. 1974. Zur Kenntnis des Eulitorals der afrikanischen Westkuste zwischen Angola und Kap der Guten Hoffnung und der afrikanischen Ostkuste von Sudafrika und Mocambique unter besonderer Berucksichtigung der Polychaeten und Ostracoden. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut 69:229-520.
  5. Hartmann, G. 1979. Die Ostracoden der Ordnung Podocopida G. W. M ller, 1894 der warm-temperierten (antiborealen) West- und Sudwestkuste Australiens (zwischen Perth im Norden und Eucla im Suden). Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut 76:219-301.
  6. Hiruta, S.-I. 1975. Studies on the recent marine Ostracoda from Hokkaido, 1. Journal of the Faculty of Science, Hokkaido University 20:117-140.
  7. Hiruta, S.-I. 1976. Two new species of Cytherois (Ostracoda, Paradoxostomatidae) from Oshoro, Hokkaido. Proceedings of the Japanese Society of Systematic Zoology 12:24-33.
  8. Horne, D.-J., A. Cohen and K. Martens. 2002. Taxonomy, morphology and biology of Quaternary and living Ostracoda. In:Holmes, J. A. & Chivas, A. R. (eds.), The Ostracoda Applications in Quaternary Research. Geophysical Monograph 131:5-36.
  9. Horne, D.-J. and J.-E. Whittaker. 1985. A revision of the genus Paradoxostoma Fischer (Crustacea; Ostracoda) in British waters. Zoological Journal of the Linnean Society 85:131-203.
  10. Ishizaki, K. 1968. Ostracodes from Uranouchi Bay, Kochi Prefecture, Japan. Scientific Reports of Tohoku University 40:1-45.
  11. Kajiyama, E. 1913. The Ostracoda of Misaki, part. 3. Zoological Magazine Tokyo 25:1-6, PI. 1. (in Japanese).
  12. Karanovic, I.S.-N. Brandao. 2014. Biogeography of deepsea wood fall, cold seep and hydrothermal vent Ostracoda (Crustacea), with the description of a new family and a taxonomic key to living Cytheroidea. Deep-Sea Research II 111:76-94.
  13. Lee, E.-H., M. Huh and E. Schornikov. 2000. Ostracod fauna from East Sea coast of Korea and their distribution-preliminary study on Ostracoda as an indicator of water pollution. Journal of the Geological Society of Korea 36:435-472.
  14. Nakao, Y. and A. Tsukagoshi. 2002. Brackish-water Ostracoda (Crustacea) from the Obitsu River Estuary, Central Japan. Species Diversity 7:67-115.
  15. Okubo, I. 1977. Fourteen species of the genus Paradoxostoma Fischer, 1855 in the Inland Sea, Japan (Ostracoda). Seto Marine Biological Laboratory 24:99-131.
  16. Okubo, I. 1978. Four species of Paradoxostoma (Ostracoda) from the Inland Sea of Japan. Proceedings of the Japanese Society of Systematic Zoology 14:10-18.
  17. Okubo, I. 1980. Taxonomic studies on Recent marine podocopid Ostracoda from the Inland Sea of Seto. Seto Marine Biological Laboratory 25:389-443.
  18. Schornikov, E.-I. 1974. On the study of ostracods (Crustacea) from the intertidal zone of Kurile Islands. Rastitelnij i zhibotnij mit litorali Kurilskih Ostrovov. Transactions of the Academy of Science USSR, Far East Science Center. Institute of Marine Biology 1:137-213214. [In Russian].
  19. Schornikov, E.-I. 1975. Ostracod fauna of the intertidal zone in the vicinity of the Seto Marine Biological Laboratory. Seto Marine Biological Laboratory 22:1-30.
  20. Schornikov, E.-I. 1993. Problems of systematics of the ostracod Paradoxostomatidae and reclassification of Paradoxostoma s.l. from Peter the Great Bay (Sea of Japan). In: Kafanov, A.-I. (ed.), Ecosystems research: Costal communities of Peter the Great Bay. Vladivostok, Far East Branch, Academy of Sciences USSR, 167-182 [in Russian].
  21. Schornikov, E.-I. and D. Keyser. 2004. The morphology and classification of Paradoxostomatinae (Ostracoda) from the nearshore zone of Madeira and the Canary Islands. Revista Espa ola de Micropaleontologia 36:57-81.
  22. Smith, R.J., J. Lee and C.H. Chang. 2014. Nonmarine Ostracoda (Crustacea) from Jeju Island, South Korea, including descriptions of two new species. Journal of Natural History 49:37-76.
  23. Tanaka, G. 2009. Adaptive modifications of carapace outline in the Cytheroidea (Ostracod: Crustacea). Biological Journal of the Linnean Society 97:810-821.
  24. Tanaka, H. and M. Arai. 2017. A new commensal ostracod Asterositus ohtsukai n. g., n. sp. (Paradoxostomatidae) on the sea star Sclerasteris euplecta (Fischer) (Asteriidae) and its feeding habits. Systematic Parasitology 94:263- 274.
  25. Titterton, R. and R.-C. Whatley. 2009. Recent marine Ostracoda from the Solomon Islands. Part 6: Cytheroidea; Paradoxostomatidae, Pectocytheridae, Trachyleberididae. Revista Espanola de Micropaleontologia 41:35-74.
  26. Tsukagoshi, A. 1994. Natural History of the Brackish-Water Ostracode Genus Ishizakiella from East Asia: Evidence for Heterochrony. Journal of the Crustacean Biology 14: 295-313.
  27. Yamaguchi, S. 2000. Phylogenetic and Biogeographical History of the Genus Ishizakiella (Ostracoda) Inferred from Mitochondrial COI Gene Sequences. Journal of the Crustacean Biology 20:357-384.
  28. Yamaguchi, S. 2003. Biogeographical History and Morphological Evolution of Two Closely Related Ostracod Species, Ishizakiella ryukyuensis and I. miurensis. Journal of Crustacean Biology 23:623-632.
  29. Yoo, H., I. Karanovic and W. Lee. 2012. First record of Ishizakiella supralittoralis (Ostracoda, Cytheroidea, Leptocytheridae) from South Korea with a key to species of the genus. Journal of Species Research 1:68-77.
  30. Yoo, H., W. Lee and I. Karanovic. 2014. The genus Paradoxostoma (Ostracoda: Podocopida: Paradoxostomatidae) from South Korea, with description of one new species. Proceedings of the Biological society of Washington 127:188-208.
  31. Whatley, R.-C and N. Keeler. 1989. Recent Ostracoda from Reunion Island, Southwestern Indian Ocean. Revue de Micropaleontologie 32:63-84.