Skip to main content Skip to main navigation menu Skip to site footer
Published: 2018-09-07

Three new species of the genera Loxoconcha and Xestoleberis (Crustacea, Ostracoda, Podocopida) from central and southern Vietnam

Ho Chi Minh City University of Food Industry (HUFI), 140 Le Trong Tan Str., Tan Phu Dist., Ho Chi Minh City, Vietnam.
Environment and Energy Systems, Graduate School of Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka City, 422-8529 Japan.
Crustacea Coral reef Loxoconcha Nha Trang Bay Phu Quoc Marine Protected Area Vietnam Xestoleberis


The present study reports three new species of Ostracoda, Loxoconcha damensis sp. nov., Xestoleberis vietnamensis sp. nov. and X. munensis sp. nov., from Phu Quoc Island, southwest Vietnam and Nha Trang Bay, central Vietnam. These species inhabit the coral reefs around isolated islands and can be easily distinguished from other known species based on their morphological differences, mainly in the male copulatory organ. Loxoconcha damensis sp. nov. belongs to Loxoconcha Group A, based on the distributional pattern of their pore system below the eye tubercle. Similarly, based on a combination of morphological types of pore systems, the two new Xestoleberis species belong to Xestoleberis Group A, because these species have two types of pore systems, i.e., sieve-type and lip-type. To the best of our knowledge, this study is the first report on Xestoleberididae and the second on Loxoconchidae from the Recent of Vietnam.



  1. Baird, W. (1850) The natural history of British Entomostraca. The Ray Society, London, 364 pp.

    Brady, G.S. (1868) Contributions to the study of the Entomostraca II. Marine Ostracoda from the Mauritius. Annals and Magazine of Natural History, 4 (2), 178–184.

    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 during the years 1873–1876, Zoology, 1, 1–184.

    Guha, D.K. (1968) On the Ostracoda from Neogene of Andaman Islands. Journal of Geological Society of India, 9, 58–66.

    Hanai, T. & Ikeya, N. (1991) Two new genera from the Omma-Manganji ostracode fauna (Plio-Pleistocene) of Japan-with a discussion of theoretical versus purely descriptive Ostracoda nomenclature. Transactions and Proceedings of the Palaeontological Society of Japan, New Series, 163, 861–878.

    Hartmann-Schröder, G. & Hartmann, G. (1978) Zur Kenntnis des Eulitorals der australischen Küsten unter besonderer Berücksichtigung der Polychaeten und Ostracoden. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 75, 63–219.

    Ishii, T., Kamiya, T. & Tsukagoshi, A. (2005) Phylogeny and evolution of Loxoconcha (Ostracoda, Crustacea) species around Japan. Hydrobiologia, 538, 81–94. 10750-004-4939-3

    Ishizaki, K. (1968) Ostracodes from Uranouchi Bay, Kochi Prefecture, Japan. Science Reports of the Tohoku University, 40, 28–34.

    Ishizaki, K. (1971) Ostracodes from Aomori Bay, Aomiri Prefecture, northeast Honshu, Japan. Science Reports of the Tohoku University, 43, 59–97.

    Kajiyama, E. (1913) The Ostracoda of Misaki, Part 1. Zoological Magazine, Tokyo, 25, 445–451. [in Japanese]

    Le, D.D. & 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., Tsukagoshi, A. & Tanaka, H. (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, 262, 43–56.

    McKenzie, K.G. & Pickett, J.W. (1984) Environmental interpretation of Late Pleistocene ostracode assemblages from the Richmond River Valley, New South Wales. Proceedings of the Royal Society of Victoria, 96, 227–242.

    Okubo, I. (1979) Three species of Xestoleberis (Ostracoda) from the Inland Sea of Japan. Proceedings of the Japan Society of Systematic Zoology, 16, 9–16.

    Okubo, I. (1980) Taxonomic studies on recent marine podocopid Ostracoda from the Inland Sea of Seto. Publications of the Seto Marine Biological Laboratory, 25, 389–443.

    Okubo, I. (1985) A new species of the genus Xestoleberis from Japan. Special Publication of the Mukaishima Marine Biological Station, 224, 123–126.

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

    Roberts, C.M., McClean, C.J., Veron, J.E.N., Hawkins, J.P., Allen, G.R., McAllister, D.E., Mittermeier, C.G., Schueler, F.W., Spalding, M., Wells, F., Vynne, C. & Werner, T.B. (2002) Marine biodiversity hotspots and conservation priorities for tropical reefs. Science, 295, 1280–1284.

    Sars, G.O. (1866) Oversigt af Norges marine Ostracoder. Forhandlinger i Videnskabs-Selskabet i Christiania, 8, 1–130. [preprint, 1865]

    Sars, G.O. (1925) Parts 5–10. Cytheridae. In: An account of the Crustacea of Norway with short descriptions and figures of all the species. Vol. 9. Ostracoda. Bergen Museum, Bergen, pp. 73–176.

    Sars, G.O. (1928) Parts 15 & 16. Cytheridae (concluded). In: An account of the Crustacea of Norway with short descriptions and figures of all the species. Vol. 9. Ostracoda. Bergen Museum, Bergen, pp. 241–277.

    Sato, T. & Kamiya, T. (2007) Taxonomy and geographical distribution of recent Xestoleberis species (Cytheroidea, Ostracoda, Crustacea) from Japan. Paleontological Research, 11, 183–227.[183:TAGDOR]2.0.CO;2

    Schornikov, E.I. (1974) On the study of ostracods (Crustacea) from the intertidal zone of the Kurile Islands. Transactions of the Academy of Science of the USSR, Far East Science Center, Institute of Marine Biology. No. 1. Nauk, Novosibirsk, pp. 137–214. [in Russian]

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

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

    Tanaka, H., Le, D.D., Higashi, R. & Tsukagoshi, A. (2016) A new interstitial ostracod species of the genus Paracobanocythere from Vietnam, with mitochondrial COI sequence data of three Asian species. ZooKeys, 559, 17–33.

    Yassini, I. & Jones, B.G. (1995) Foraminiferida and ostracoda from estuarine and shelf environments on the southeastern coast of Australia. The University of Wollongong Press, Wollongong, 484 pp.