Sexual Dimorphism in Carapace Morphology of <i>Carcinoplax longimanus</i>: A Simple Discriminating Method and its Application to Fossil Specimens

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  • IZUMI Kentaro
    Faculty & Graduate School of Education, Chiba University School of Science and Engineering, Kokushikan University
  • SATO Takehiro
    Kanagawa Prefectural Museum of Natural History

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  • 甲の形態に見られるエンコウガニの性的二型：簡易的判別法の確立と化石個体への適用
  • コウ ノ ケイタイ ニ ミラレル エンコウガニ ノ セイテキ ニガタ : カンイテキ ハンベツホウ ノ カクリツ ト カセキ コタイ エ ノ テキヨウ

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<p> Morphological parameters of the carapace of Carcinoplax longimanus from the Sagami Bay were measured and statistically analyzed to make establish a simple sex discriminating method. Significant sexual differences in carapace aspect ratio and orbital cavity width/carapace width ratio were not detected. On the other hand, sexual differences in two abdomen morphological parameters, although not clear, were recognized. By combining these abdomen parameters, male and female are distinguished. Furthermore, we tested the utility of the present sex discriminating method for fossils, by using two Carcinoplax longimanus fossil specimens from the Lower Pleistocene Iimuro Formation, Kazusa Group. As a result, sex of both fossil specimens could be determined. The present sex discriminating method is important because it is applicable for isolated carapace of both modern and fossil Carcinoplax longimanus.</p>

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