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      A new species of Enterognathus (Copepoda, Cyclopoida, Enterognathidae) collected from the Seto Inland Sea, western Japan

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          Abstract

          Abstract

          A new species of the endoparasitic copepod Enterognathus ( Cyclopoida, Enterognathidae) is described from a crinoid host in the Seto Inland Sea, western Japan. This is a third species of the genus and its first occurrence in the Pacific Ocean. The new species is distinguished from two previously known congeners by the morphology of the body somites, caudal rami, antennae and legs. Crinoid parasites belonging to Enterognathus and the closely related genus Parenterognathus have a broad distribution from the northeastern Atlantic through the Red Sea to the West Pacific.

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          A new genus of endoparasitic copepods (Cyclopoida: Enterognathidae), forming a gall in the calyx of deep-sea crinoids.

          A new genus and species of cyclopoid copepod belonging to the family Enterognathidae, Parenterognathus troglodytes, is described from a gall on the calyx of the deep-sea crinoid Glyptometra crassa (Clark, 1912) collected at depths of 775-787 m off Kumano-nada, middle Japan. The new genus can be distinguished from the three known genera of the family by body tagmosis and by the segmentation and armature of the appendages. This is the first record of this family from the Pacific Ocean. This family seems to be host-specific to relatively basal deuterostomes, such as echinoderms and hemichordates. The evolutionary transformation and history of the Enterognathidae are briefly discussed.
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            Author and article information

            Contributors
            URI : urn:lsid:zoobank.org:author:D51A834E-7796-48AF-9F1E-E1C28039F980
            URI : urn:lsid:zoobank.org:author:142F0F2F-875F-44EE-BC9C-DDFF1AF8DEDB
            URI : urn:lsid:zoobank.org:author:AE1FDC59-7F4D-4A7E-A8DA-2E84058403D4
            Journal
            Zookeys
            Zookeys
            ZooKeys
            ZooKeys
            Pensoft Publishers
            1313-2989
            1313-2970
            2012
            5 April 2012
            : 180
            : 1-8
            Affiliations
            [1 ]Takehara Marine Science Station, Setouchi Field Science Center, Hiroshima University, 5-8-1 Minato-machi, Takehara, Hiroshima 725-0024, Japan
            [2 ]Kitakyushu Museum of Natural History and Human History, Kitakyushu 805-0071, Japan
            [3 ]Atmosphere and Ocean Research Institute, the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
            Author notes
            Corresponding author: Susumu Ohtsuka ( ohtsuka@ 123456hiroshima-u.ac.jp )

            Academic editor: D. Defaye

            Article
            10.3897/zookeys.180.2509
            3332005
            22539902
            3b6e49fb-2204-48dc-b615-35f39ff08433
            Susumu Ohtsuka, Michitaka Shimomura, Kota Kitazawa

            This is an open access article distributed under the terms of the Creative Commons Attribution License 3.0 (CC-BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

            History
            : 7 December 2011
            : 28 March 2012
            Categories
            Article

            Animal science & Zoology
            copepoda,symbiosis,enterognathidae,cyclopoida,seto inland sea
            Animal science & Zoology
            copepoda, symbiosis, enterognathidae, cyclopoida, seto inland sea

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