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Appendage Homologies and the First Record of Eyes in Platycopid Ostracods, with the Description of a New Species of Keijcyoidea (Crustacea: Ostracoda) from Japan

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Abstract

A median nauplius eye is reported for the first time in a platycopid ostracod, a group hitherto considered to be blind. A new species of the platycopid ostracod genus Keijcyoidea is described from coastal rocky marine habitats on the Pacific coast of Japan. Observations of living specimens in the laboratory show that it is capable of burrowing to a depth of several millimeters in sandy sediment, using the first two head appendages (antennulae and antennae) and the furca. Females brooded a maximum of five eggs in the posterior brood space of the carapace. The homologies and phylogenetic implications of the trunk segmentation and limbs are discussed, paying particular attention to the sexually dimorphic fifth and sixth limbs; the copulatory appendages of both sexes are interpreted as being attached to trunk segments T6–T7 (counting from the posterior; T1 = posteriormost segment).

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Authors and Affiliations

  1. Department of Biology & Geosciences, Faculty of Science, Shizuoka University, Oya 836, 422-8529, Shizuoka, Japan

    Akira Tsukagoshi & Reiko Okada

  2. Department of Geography, Queen Mary, University of London, Mile End Road, London, E1 4NS, UK

    David J. Horne

  3. Department of Zoology, the Natural History Museum, Cromwell Road, London, SW7 5BD, UK

    David J. Horne

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  1. Akira Tsukagoshi
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  2. Reiko Okada
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  3. David J. Horne
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Correspondence to Akira Tsukagoshi.

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Tsukagoshi, A., Okada, R. & Horne, D.J. Appendage Homologies and the First Record of Eyes in Platycopid Ostracods, with the Description of a New Species of Keijcyoidea (Crustacea: Ostracoda) from Japan. Hydrobiologia 559, 255–274 (2006). https://doi.org/10.1007/s10750-005-1139-8

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  • DOI: https://doi.org/10.1007/s10750-005-1139-8

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