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Article
Published: 2022-05-12

Morphological types of male copulatory organs of Bicornucythere bisanensis (Ostracoda, Crustacea) and the description of a new Bicornucythere species

Environment and Energy Systems, Graduate School of Science and Technology, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka City, 422-8529 Japan.
Environment and Energy Systems, Graduate School of Science and Technology, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka City, 422-8529 Japan.
Crustacea intraspecific variation new species taxonomy mating frequency

Abstract

This study is designed to evaluate the male copulatory organs and carapace size of the inner bay benthic ostracod Bicornucythere bisanensis. The male copulatory organs demonstrate noticeable intraspecific variation in the distal lobe, especially the length of the tip, which shows a gradual variation; whereas the thickness of the distal lobe is conservative within the species. The population from central Japan (Aburatsubo Cove) showed remarkable morphological variations, with four copulatory organ types, each type defined by a combination of four shapes of the right and left distal lobes (Shape R, r, L, and l). While the variety of carapace morphotypes have been previously reported, our findings suggest that one morphotype from western Japan (Misumi-cho) should be treated as a distinct species. Thus, we described it as Bicornucythere misumiensis sp. nov.

 

References

  1. Abe, K. (1988) Speciation completed? in Keijella bisanensis species group. In: Hanai, T., Ikeya, N. & Ishizaki, K. (Eds.), Evolutionary biology of ostracoda: its fundamentals and applications. Kodansha-Elsevier, Tokyo, pp. 919–925. https://doi.org/10.1016/S0920-5446(08)70229-2
    Abe, K. & Choe, K.L. (1988) Variation of Pistocythereis and Keijella species in Gamagyang Bay, south coast of Korea. In: Hanai, T., Ikeya, N. & Ishizaki, K. (Eds.), Evolutionary biology of ostracoda: its fundamentals and applications. Kodansha-Elsevier, Tokyo, pp. 367–373. https://doi.org/10.1016/S0920-5446(08)70195-X
    Abe, K. & Vannier, J. (1991) Mating behavior in the podocopid ostracode Bicornucythere bisanensis (Okubo, 1975): Rotation of a female by a male with asymmetric fifth limbs. Journal of Crustacean Biology, 11, 250–260. https://doi.org/10.2307/1548362
    Baird, W. (1850) The Natural History of the British Entomostraca. Ray Society, London, 364 pp. https://doi.org/10.5962/bhl.title.39641
    Bodergat, A.M. & Ikeya, N. (1988) Distribution of Recent Ostracoda in Ise and Mikawa Bays, Pacific coast of central Japan. In: Hanai, T., Ikeya, N. & Ishizaki, K. (Eds.), Evolutionary biology of ostracoda and its fundamentals and applications. Kodansha-Elsevier, Tokyo, pp. 413–428. https://doi.org/10.1016/S0920-5446(08)70198-5
    Bodergat, A.M., Ishizaki, K., Oki, K. & Rio, M. (2002) Currents, civilization, or volcanism? Ostracodes as sentinels in a patchy environment: Kagoshima Bay, Japan. Micropaleontology, 48, 285–299. https://doi.org/10.2113/48.3.285
    Brady, G.S. (1866) On new or imperfectly known species of marine Ostracoda. The Transactions of the Zoological Society of London, 5, 359–393. https://doi.org/10.1111/j.1096-3642.1866.tb00649.x
    Brady, G.S. (1868) Chapitre XV: Abords de l'île North-Watcher. In: de Folin, L. & Périer, L. (Eds.), Les Fonds de la Mer. Étude sur les particularités nouvelles des régions sous-marines. Tome Premier. Savy, Paris, pp. 70–72.
    Brady, G.S. (1869) Les entomostraces de Hong Kong. In: Folin, L. de & Perier, L. (Eds.), Les Fonds de la Mer, 1, 155–159.
    Brady, G.S. (1880) Report on the Ostracoda dredged by H. M. S. Challenger, during the years 1873‒1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger, Zoology, 1, 1–184. https://doi.org/10.5962/bhl.title.59771
    CraftMAP (2006) CraftMAP-Blank map of Japan and the World. Available from: http://www.craftmap.box-i.net/ (accessed 19 October 2021)
    Frydl, P.M. (1982) Holocene ostracods in the southern Boso Peninsula. The University Museum, The University of Tokyo Bulletin, 20, 15–59.
    Gou, Y.X., Zheng, S.Y. & Huang, B.R. (1983) Pliocene ostracode fauna of Leizhou Peninsula and northern Hainan Island, Guangdong Province. China Social Sciences Press, Beijing, 134 pp.
    Gross, M.R. (1996) Alternative reproductive strategies and tactics: diversity within sexes. Trends in Ecology and Evolution, 11, 92–98. https://doi.org/10.1016/0169-5347(96)81050-0
    Hanai, T., Ikeya, N., Ishizaki, K., Sekiguchi, Y. & Yajima, M. (1977) Checklist of Ostracoda from Japan and its adjacent seas. University Museum, University of Tokyo Bulletin, 12, 1–119.
    Hanai, T., Ikeya, N. & Yajima, M. (1980) Checklist of Ostracoda from South East Asia. University Museum, University of Tokyo Bulletin, 17, 1–236.
    Higashi, R., Tsukagoshi, A., Kimura, H. & Kato, K. (2011) Male dimorphism in a new interstitial species of the genus Microloxoconcha (Podocopida: Ostracoda). Journal of Crustacean Biology, 31, 142–152. https://doi.org/10.1651/09-3234.1
    Ikeya, N. & Ito, H. (1991) Recent Ostracoda from the Sendai Bay region, Pacific coast of northeastern Japan. Reports of Faculty of Science, Shizuoka University, 25, 93–145.
    Irizuki, T., Gotomyo, A., Kawano, S., Yoshioka, K. & Nomura, R. (2009) Relationships between Recent ostracode assemblage and environmental factors in the northern part of Harima-nada Bay off Aioi City, Hyogo Prefecture, Southwest Japan. Geoscience Reports of Shimane University, 28, 1–9. [in Japanese with English abstract]
    Irizuki, T., Ito, H., Yoshioka, K., Kawano, S., Nomura, R., Tanaka, Y. & Sako, M. (2010) Recent ostracode assemblages and the marine environment around Kasado Bay in northeastern Suo-nada Bay, Yamaguchi Prefecture, southwest Japan. Geoscience Reports of Shimane University, 29, 11–20. [in Japanese with English abstract]
    Irizuki, T., Nakamura, Y., Takayasu, K. & Sakai, S. (2003) Faunal changes in Ostracoda (Crustacea) in Lake Nakaumi, southwest Japan, over the last 40 years. Geoscience Reports of Shimane University, 22, 149–160. [in Japanese with English abstract]
    Irizuki, T., Seto, K. & Nomura, R. (2008) The impact of fish farming and bank construction on Ostracoda in Uranouchi Bay on the Pacific coast of southwest Japan—Faunal changes between 1954 and 2002/2005. Paleontological Research, 12, 283–302. https://doi.org/10.2517/1342-8144-12.3.283
    Ishizaki, K. (1968) Ostracodes from Uranouchi Bay, Kochi Prefecture, Japan. Science Reports of the Tohoku University, Sendai, Japan, Series 2 (Geology), 40, 1–45.
    Ishizaki, K. (1969) Ostracodes from Shinjiko and Nakanoumi, Shimane Prefecture, western Honshu, Japan. Science Reports of the Tohoku University, Sendai, Japan, Series 2 (Geology), 41, 197–224.
    Ishizaki, K. (1971) Ostracodes from Aomori Bay, Aomori Prefecture, northeast Honshu, Japan. Science Reports of the Tohoku University, Sendai, Japan, Series 2 (Geology), 43, 59–97.
    Kajiyama, E. (1913) On the Ostracoda from Misaki, Part 3. Doubutsugaku Zasshi, 25, 1‒16. [in Japanese]
    Kamiya, T., Ozawa, H. & Obata, M. (2001) Quaternary and Recent marine Ostracoda in Hokuriku district, the Japan Sea coast. In: Ikeya, N. (Ed.), ISO2001. Field Excursion Guidebook of the 14th International Symposiumo of Ostracoda, Shizuoka. Organizing Committee of ISO 2001, Shizuoka, pp. 1–20.
    Masuma, T. & Yamada, K. (2014) Recent ostracode distributions in Kumihama Bay (brackish lake) in the northern part of Kyoto Prefecture, central Japan. Laguna, 21, 1–14. [in Japanese with English abstract]
    Mostafawi, N. (1992) Recent ostracods from the central part of Sunda Shelf, between the Malay Peninsula and Borneo. Senckenbergiana Lethea, 72, 129–168. [in German]
    Nakao, Y. & Tsukagoshi, A. (2002) Brackish-water Ostracoda (Crustacea) from the Obitsu River estuary, central Japan. Species Diversity, 7, 67–115. https://doi.org/10.12782/specdiv.7.67
    Okada, Y. (1981) Development of cell arrangement in ostracod carapaces. Paleobiology, 7, 276–280. https://doi.org/10.1017/S009483730000405X
    Okada, Y. (1982) Ultrastructure and pattern of the carapace of Bicornucythere bisanensis (Ostracoda, Crustacea). The University Museum, The University of Tokyo Bulletin, 20, 230–255.
    Okubo, I. (1975) Callistocythere pumila Hanai, 1957 and Leguminocythereis bisanensis sp. nov. in the Inland Sea, Japan (Ostracoda). Proceedings of the Japanese Society of Systematic Zoology, 11, 22–31.
    Okubo, I. (1979) Three species of Xestoleberis (Ostracoda) from the Inland Sea of Japan. Proceedings of the Japanese Society of Systematic Zoology, 16, 8–17.
    Sars, G.O. (1866) Oversigt af Norges marine Ostracoder. Forhandlingeri Videnskabs-Selskabet Christiania, 8, 1–130.
    Schornikov, E.I. & Shaitarov, S.V. (1979) A new genus of ostracods from Far-eastern seas. Biologija Morija, 2, 41–47. [in Russian with English abstract]
    Sylvester-Bradley, P.C. (1948) The ostracode genus Cythereis. Journal of Paleontology, 22, 792–797.
    Takayasu, K., Ueda, K. & Ohta, H. (1990) Natural history of the Nakano-umi and Shinji Lakes ―XII. Ostracode thanatocoenoces from the bottom deposits of Lake Nakano-umi and their historical distribution. Geological Reports of Shimane University, 9, 129–144. [in Japanese with English abstract]
    Tanaka, G., Seto, K. & Takayasu, K. (1998) The relationship between environments and ostracode assemblages from Miho Bay to Lake Shinji. Laguna, 5, 81–91. [in Japanese with English abstract]
    Whatley, R.C. & Zhao, Q. (1987) Recent Ostracoda of the Malacca Straits, part I. Revista Espanola de Micropaleontologie, 19, 327–366.
    Whatley, R.C. & Zhao, Q. (1988) Recent Ostracoda of the Malacca Straits, part II. Revista Espanola de Micropaleontologie, 20, 5–37.
    Yamaguchi, T., Suzuki, H., Soe, A.N., Htike, T., Nomura, R. & Takai, M. (2015) A new late Eocene Bicornucythere species (Ostracoda, Crustacea) from Myanmar, and its significance for the evolutionary history of the genus. Zootaxa, 3919 (2), 306–326. https://doi.org/10.11646/zootaxa.3919.2.4
    Yamane, K. (1998) Recent ostracode assemblages from Hiuchi-nada Bay, Seto Inland Sea of Japan. Bulletin of Ehime Prefectual Science Museum, 3, 19–59. [in Japanese with English abstract]
    Yasuhara, M. & Irizuki, T. (2001) Recent Ostracoda from the northern part of Osaka Bay, southwestern Japan. Journal of Geosciences, Osaka City University, 44, 57–95.
    Zenina, M.A. & Schornikov, E.I. (2008) Ostracod assemblages of the freshened part of Amursky Bay and lower reaches of the Razdolnaya River (Sea of Japan). In: Lutaenko, K.A. & Vaschenko, M.A. (Eds.), Ecological studies and the state of the ecosystem of Amursky Bay and the estuarine zone of the Razdolnaya River (Sea of Japan). Russian Acadamy of Sciences Far East Branch, Zhirmunsky Institute of Marine Biology, Vladivostok Dalnauka, pp. 156–185.
    Zhao, Q. & Wang, P. (1988) Distribution of modern Ostracoda in the shelf seas off China. In: Hanai, T., Ikeya, N. & Ishizaki, K. (Eds.), Evolutionary biology of Ostracoda: its fundamentals and applications. Kodansha, Elsevier, Amsterdam, pp. 805–821. https://doi.org/10.1016/S0920-5446(08)70223-1