Abstract
We describe Terrestricythere proboscidis sp. nov. from a littoral interstitial habitat at Orito Beach, Matsumae, southern Hokkaido, Japan, a site characterized by coarse sand with many pebbles. This is the fifth known species of the ostracod superfamily Terrestricytheroidea, the first interstitial species of the superfamily, and the first record of the superfamily from Japan. The new species is clearly distinguished from its four known congeners by its small carapace with a transversely flat ventral margin, and the seventh limb consisting of four podomeres; its hemipenis has a long, S-curved process. We also report here the habitat, microdistribution, and locomotory behavior of the new species. Quantitative sampling revealed that the species lives in an interstitial environment. T. proboscidis is euryhaline. Behavioral observations showed that T. proboscidis cannot swim, but uses its appendages to push itself among sediment grains. An analysis of variance showed temperature and grain size, as well as temperature-depth and temperature-grain size interactions, to be significant influences on variation in population density. Sediment moisture content is correlated with these variables and likely is a primary factor in this species’ microdistribution.
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References
Danielopol, D. L. & G. Hartmann, 1986. Ostracoda. Part I: Stygobiont Ostracoda from Inland Subterranean Waters. Part II: Die marinen Ostracoden der interstitiellen Lebensräume. In Botosaneanu, L. (ed), Stygofauna Mundi. A Faunistic, Distributional, and Ecological Synthesis of the World Fauna Inhabiting Subterranean Waters (Including the Marine Interstitial). E. J. Brill, Leiden, 265–294.
Hartmann, G. & H. S. Puri, 1974. Summary of neontological and paleontological classification of Ostracoda. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut 70: 7–73.
Hiruta, S., 2003. Notes on marine interstitial animals from Esashi, southern Hokkaido. Kushiro Ronsyu 34: 63–69. [In Japanese, with English abstract].
Horne, D. J., R. J. Smith, J. E. Whittaker & J. W. Murray, 2004. The first British record and a new species of the superfamily Terrestricytheroidea (Crustacea, Ostracoda): morphology, ontogeny, lifestyle and phylogeny. Zoological Journal of the Linnean Society 142: 253–288.
Nation, J. L., 1983. A new method using hexamethyldisilazane for prepararion of soft insect tissues for scanning electron microscopy. Stain Technology 58: 347–351.
Maddocks, R. F., 1976. Pussellinae are interstitial Bairdiidae (Ostracoda). Micropaleontology 22: 194–214.
Schornikov, E. I., 1969. A new family of Ostracoda from the supralittoral zone of the Kuril Islands. Zoologicheskiy Zhurnal 48: 494–498. [In Russian with English abstract].
Schornikov, E. I., 1980. Ostracods in terrestrial biotopes. Zoologicheskiy Zhurnal 59: 1306–1319. [In Russian with English abstract].
Acknowledgements
We are grateful to Dr. D. J. Horne (Queen Mary University of London) and Dr. R. J. Smith (Lake Biwa Museum) for valuable advice, and to Dr. M. H. Dick (Hokkaido University) for critical reading of the manuscript and valuable comments.
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Hiruta, S.F., Hiruta, Si. & Mawatari, S.F. A new, interstitial species of Terrestricythere (Crustacea: Ostracoda) and its microdistribution at Orito Beach, northeastern Sea of Japan. Hydrobiologia 585, 43–56 (2007). https://doi.org/10.1007/s10750-007-0627-4
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DOI: https://doi.org/10.1007/s10750-007-0627-4