Variation of Number of Pores on the Carapaces of Group A Species of the Genus Loxoconcha (Crustacea, Ostracoda) Following the Molting

D. D. Le

doi:10.15407/zoo2024.01.069

D. D. Le Ho Chi Minh City University of Industry and Trade (HUIT), Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-9519-8878

DOI: https://doi.org/10.15407/zoo2024.01.069

Keywords: Crustacea, Ostracoda, Loxoconcha, classification, phylogeny, morphology

Abstract

Phylogeny of all extant twenty-eight species of Group A of the genus Loxoconcha are examined in this study. Basing on the total number of pores on carapaces, three species subgroups of this genus are shown by Differentiation of Distributional pattern of Pore-system (DDP) analysis. All species possess identical number and same distributional pattern of pore-system in and before A-4 instar. The difference in the total number of pores on carapaces is found from the instar A-3 to adult and thus three patterns are recognized. In the instar A-3, these numbers of subgroup A1, A2 and A3 are 42, 43 and 44, respectively. Additionally, the present study shows an identical number of anterior false radial pores among the subgroups at all instars. However, the number of posterior false radial pores is different among three subgroups from A-3 instar. In this instar, these numbers of subgroup A1, A2 and A3 are equivalent to 3, 4 and 5. By combination of this study and previous studies, geographical distribution of three subgroups is shown. Species of subgroup A1 distribute worldwide except the distributional areas of subgroups A2 and A3. While, species of subgroup A2 and A3 only reside in Atlantic coasts of Europe, northern Africa and coasts of the Mediterranean Sea.

References

Athersuch, J., Horne, D. J. & Whittaker, J. E. 1989. Marine and Brackish Water Ostracods. E. J. Brill, Leiden, 1-343. (Synopses of the British Fauna (new series), 43)

https://doi.org/10.1163/9789004627666_003

Bonaduce, G., Ruggieri, G., Russo, A. & Serept, H. B. 1992. Late Miocene ostracods from the Ashtart 1 well (Gulf of Gabes, Tunosia). Bolletino della Societa Paleontologica Italiana, 31 (1), 3-93.

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

on 2015-04-27 [Date Accessed 15 April 2015].

Garbett, E. C. & Maddocks, R. F. 1979. Zoogeography of Holocene Cytheracean ostracodes in the Bays of Texas. Journal of Paleontology, 53 (4), 841-919.

Ikeya, N. 1997. Crustacean Biogeography in the western Pacific-diversification process of the littoral fauna, 1-113 (in Japanese).

Ishii, T., 2004. Phylogeny and evolution of the genus Loxoconcha and related genera (Ostracoda, Crustacea). PhD thesis. Kanazawa University, 1-108.

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

https://doi.org/10.1007/s10750-004-4939-3

Ishizaki, K. 1963. Japanese Miocene ostracodes from the Sunakozaka Member of the Yatsuo Formation, east of Kanazawa City, Ishikawa Prefecture. Japanese Journal Geol. Geogr., 34, 19-34.

Irizuki, T., Yamada, K., Maruyama, T. & Ito, H. 2004. Paleoecology and taxonomy of Early Miocene Ostracoda and paleoenvironments of the eastern Setouchi Province, central Japan. Micropaleontology, 50 (2), 105-147.

https://doi.org/10.2113/50.2.105

Kamiya, T. 1988. Morphological and ethological adaptations of Ostracoda to microhabitats in Zostera beds. In: Hanai, T., Ikeya, N. & Ishizaki, K., eds. Evolutionary Biology of Ostracoda, its Fundamentals and Applications. Proceedings of the 9th International Symposium on Ostracoda: Kodansha, Tokyo, 303-318.

https://doi.org/10.1016/S0920-5446(08)70191-2

Kamiya, T. 1989. Differences between the sensory organs of phytal and bottom-dwelling Loxoconcha (Ostracoda, Crustacea). Journal Micropalaeontol, 8, 37_47.

https://doi.org/10.1144/jm.8.1.37

Kamiya, T. 1997. Phylogeny estimated from fossil information-the pore-systems of Ostracoda. Iden (Genetics), 51, 28-34 (In Japanese).

Le, D. D., 2015. Origin of the ostracod fauna in the Okinawa Islands, southern Japan, inferred from the two genera Loxoconcha and Xestoleberis (Arthropoda: Crustacea). PhD thesis, Shizuoka University, 123 pp.

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

https://doi.org/10.11646/zootaxa.3796.1.7

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.

https://doi.org/10.1016/j.jcz.2016.03.009

McKenzie, K. G. 1967. Recent Ostracoda from Port Phillip Bay, Victoria. Royal Society of Victoria, 8 (1), 61-106.

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

Puri, H. S. 1960. Recent Ostracoda from the west coast of Florida. Gulf Coast Association of Geological Societies Transactions, 10, 107-149.

Puri, H. S. & Hulings, N. C. 1957. Recent Ostracoda facies from Panama City to Florida bay area. Transactions Gulf Coast Association of Geological Societies, 7, 167-190.

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

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

https://doi.org/10.2517/1342-8144(2007)11[183:TAGDOR]2.0.CO;2

Smith, R. J. & Kamiya, T. 2003. The ontogeny of Loxoconcha japonica Ishizaki, 1968 (Cytheroidea, Ostracoda, Crustacea). Hydrobiologia, 490, 31-52.

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

Teeter, J. W. 1975. Distribution of Holocene marine Ostracoda from Belize. In: Wantland, K. F., & Pusey, W. C., eds. Belize shelf: Carbonate sediments, clastic sediments and ecology and a paper on Petrology and diagenesis of carbonate eolianites of northeastern Yucatan Peninsula. American Assoc. Petroleum Geologists, Mexico, 400-499.

Tsukagoshi, A. 1990. Ontogenetic change of distribution pattern of pore system in Cythere species and its phylogenetic significance. Lethaia, 23, 225-241.

https://doi.org/10.1111/j.1502-3931.1990.tb01450.x

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, 1-484.