Species composition of Ostracoda in the Okinawa islands, and geographical distribution of the two genera \(\textit{Loxoconcha}\) and \(\textit{Xestoleberis}\) (Arthropoda: Crustacea) around Japan

Doan Dung Le; Akira Tsukagoshi

doi:10.15625/1859-3097/17966

Author affiliations

Authors

Le Doan Dung Ho Chi Minh City University of Industry and Trade, Ho Chi Minh City, Vietnam
Akira Tsukagoshi Shizuoka University, 836 Oya, Suruga Ward, Shizuoka, Japan

DOI:

https://doi.org/10.15625/1859-3097/17966

Keywords:

Loxoconcha, Xestoleberis, evolution, migration, origin.

Abstract

This study was conducted in the period of 2012 to 2015 in some locations of Japan. At each location, samplings were carried out on reef slopes using SCUBA diving, on reef flats, tidal beaches and river mouths during low tide. The specimens then were treated using a differential interference contrast microscope with a camera lucida (BX-50, OLYMPUS), a quick auto-coater (JFC-1500, Ion Sputtering Device), a scanning electron microscope (SEM) in the laboratory of Shizuoka University,… The result shows that total 139 species of recent ostracoda belonging to 28 families, 70 genera recorded in the Okinawa Islands, southern Japan are found. Most diversified families include Loxoconchidae (26 species - 18.7%), Xestoleberididae (17 species - 12.2%), Bairdiidae (13 species - 9.4%), Hemicytheridae (13 species - 9.4%), Leptocytheridae (8 species - 5.8%). Based on the distributional pattern of pore systems located below the eye tubercle of Loxoconcha and the types of pores on carapaces of Xestoleberis, the species groups of the two genera were divided into three groups, i.e., Groups A, B and C. Geographical distribution of three species groups was shown for each location in the present report. The geographical distribution of three species phylogenetic groups (i.e. Groups A, B and C) of the two genera Loxoconcha and Xestoleberis suggests that the fauna of two genera in the Okinawa islands are more similar to southern faunas (e.g., Vietnam, Philippines, Australia,…) than Japanese Island Arc fauna. Hence, the origin of two genera Loxoconcha and Xestoleberis in the Okinawa islands, southern Japan may be from the South.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...

References

Nohara, T., 1976. The ostracode genus Cytherelloidea from the Ryukyus. Bulletin of College of Education, University of the Ryukyus, 20, 1–6.

Nohara, T., 1981. Notes on the ostracode genus Cytherelloidea from the Senkaku-retto, Okinawa. Biological Magazine Okinawa, 19, 41–45.

Nohara, T., and Tomoyose, N., 1977. Note on a few Cytherelloidea ostracodes from East China Sea, Okinawa. Marine Sciences, 9, 46–48. (in Japanese with English abstract).

Nohara, T., and Tsukishima, I., 1980. Distribution of ostracodes of coral reefs on Okinawa-jima. Bulletin of College of Education, University of the Ryukyus, 24, 57–63. (in Japanese with English abstract).

Nohara, T., and Yabu, S., 1983. Notes on Ostracode genus Saida from the Ryukyus. Bulletin of the College of Education, University of the Ryukyus, 26, 65–71.

Tabuki, R., and Nohara, T., 1988. Preliminary study on the ecology of ostracods from the moat of a coral reef off Sesoko island, Okinawa, Japan. In Developments in Palaeontology and Stratigraphy (Vol. 11, pp. 429–437). Elsevier.

Brandão, S. N., Angel, M. V., Karanovic, I., Parker, A., Perrier, V., Sames, B., and Yasuhara M., 2015. World Ostracoda Database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=127643 on April 27, 2015.

Nakao, Y., and Tsukagoshi, A., 2002. Brackish-water Ostracoda (Crustacea) from the Obitsu river estuary, Central Japan. Species Diversity, 7(1), 67–115.

Tanaka, G., and Ikeya, N., 2002. Migration and speciation of the Loxoconcha japonica species group (Ostracoda) in East Asia. Paleontological Research, 6(3), 265–284.

Sato, T., and Kamiya, T., 2007. Taxonomy and geographical distribution of recent Xestoleberis species (Cytheroidea, Ostracoda, Crustacea) from Japan. Paleontological Research, 11(2), 183–227.

Le Doan, D., and Tsukagoshi, A., 2014. Three new species of the genus Loxoconcha (Crustacea, Ostracoda, Podocopida) from the Okinawa islands, southern Japan. Zootaxa, 3796(1), 147–165.

Le, D. D., Akira, T., and Hayato, T., 2016. Ontogenetic changes of the maxillula in Loxoconcha (Crustacea, Ostracoda, Podocopida), with a description of a new species from the Okinawa islands (Japan). Zoologischer Anzeiger-A Journal of Comparative Zoology, 262, 43–56.

Sars, G. O., 1866. Oversigt af Norges marine ostracoder. Det Norske Videnskaps-Akademi Forhandlingar, 1–130.

Yassini, I., and Jones, B. G., 1995. Foraminiferida and Ostracoda from estuarine and shelf environments on the Southeastern coast of Australia. The University of Wollongong Press, 484 pp.

Ishii, T., Kamiya, T., and Tsukagoshi, A., 2005. Phylogeny and evolution of Loxoconcha (Ostracoda, Crustacea) species around Japan. Hydrobiologia, 538, 81–94.

Puri, H. S., 1974. Normal pores and the phylogeny of Ostracoda. Geoscience and Man, 6, 137–151.

Ikeya, N., 1992. Modern ostracode fauna from Otsuchi bay, the Pacific coast of Northeastern Japan. Centenary of Japanese Micropaleontology, 339–354.

Tanaka, G., 2008. Recent benthonic ostracod assemblages as indicators of the Tsushima warm current in the Southwestern Sea of Japan. Hydrobiologia, 598, 271–284.

Ikeya, N., 1982. Ecology of Recent ostracodes in the Hamanako region, the Pacific coast of Japan. Bulletin of the University Museum, The University of Tokyo, 20, 15–59.

Yamane, K., 1998. Recent ostracode assemblages from Hiuchi-nada bay, Seto Inland Sea of Japan. Bulletin of the Ehime Prefectural Science Museum, 3, 81–91. (in Japanese with English abstract).

Ozawa, H., and Tsukawaki, S., 2008. Preliminary report on modern ostracods in surface sediment samples collected during RV Tansei-maru Cruise KT04-20 in the Southwestern Okhotsk Sea and the Northeastern Japan Sea off Hokkaido, North Japan. Annals of the Research Institute of the Japan Sea Region, 39, 31–48.

Whatley, R. C., and Zhao, Q., 1987. Recent ostracoda of the Malacca straits: Part I. Revista Espanola de Micropaleontologia, 19(3), 327–366.

Whatley, R., and Quanhong, Z., 1988. Recent ostracoda of the malacca straits. Part. II. (Continuation). Revista Espanola de Micropaleontologia, 20(1), 5–37.

Zhao, Q., and Wang, P., 1988. Distribution of modern Ostracoda in the shelf seas off China. In Developments in Palaeontology and Stratigraphy (Vol. 11, pp. 805–821). Elsevier.

Tanaka, G., Komatsu, T., and Phong, N. D., 2009. Recent ostracod assemblages from the northeastern coast of Vietnam and the biogeographical significance of the euryhaline species. Micropaleontology, 55(4), 365–382.

Tsukagoshi, A., 2019. First report on two ostracod genera Loxoconcha Sars, 1866 (Loxoconchidae) and Xestoleberis Sars, 1866 (Xestoleberididae) along the coast of Vietnam. Tap chi Sinh hoc, 41(4), 15–24.

Howe, H. V., and McKenzie, K. G., 1989. Recent marine Ostracoda (Crustacea) from Darwin and North-Western Australia. Northern Territory Museum of Arts and Sciences Monograph Series, 3, 1–50.

Whatley, R. C., and Watson, K., 1988. A preliminary account of the distribution of Ostracoda in recent reef and reef associated environments in the Pulau Seribu or Thousand Island Group, Java Sea. In Developments in Palaeontology and Stratigraphy (Vol. 11, pp. 399–411). Elsevier.

Ishii, T., 2004. Phylogeny and evolution of the genus Loxoconcha and related genera (Ostracoda, Crustacea). Kanazawa University: PhD Thesis, 1–85.

Nohara, T., 1987. Cenozoic ostracodes of Okinawa-jima. Bulletin of Collage of Education, University of the Ryukyus, 30, 1–105.

Omori, M., Takahashi, K., Moriwake, N., Osada, K., Kimura, T., Kinoshita, F., Maso, S., Shimoike, K., and Hibino, K., 2004. Coral reefs of Japan. Ministry of the Environment, 284 pp.

Kamiya, T., 1988. Morphological and ethological adaptations of Ostracoda to microhabitats in Zostera beds. In Evolutionary Biology of Ostracoda (Proceedings of the 9th International Symposium on Ostracoda) (pp. 303–318). Kodansha.

Nohara, T., 1981. Ostracodes of Pleistocene Naha Limestone, Okinawa-jima. Bull College of Educ, Univ of the Ryukyus, 25, 35–47.

Nohara, T., and Tabuki, R., 1990. Seasonal distribution of Ostracoda on two species of marine plants and two holothurians in Okinawa, Japan. In Ostracoda and Global Events (pp. 355–363). Springer Netherlands.