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Dangoka Japonica Nov. Gen. Nov. Sp. and Eudactylinella Alba Wilson, 1932 (Copepoda, Siphonostomatoida, Eudactylinidae) Infesting Japanese Elasmobranchs

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[A description of Dangoka japonica nov. gen. nov. sp. and a redescription of Eudactylinella alba Wilson, 1932 are given based on specimens recovered from the branchial lamellae of two Japanese guitarfishes, Rhinobatos schlegelii Müller & Henle, 1841 and R. hynnicephalus Richardson, 1846 (Rhinobatidae), and of two Japanese dasyatid rays, Taeniura meyeni Müller & Henle, 1841 and Daystis akajei (Müller & Henle, 1841) (Dasyatidae), respectively. D. japonica nov. gen. nov. sp. is easily distinguishable from all confamilial species in having in the female a combination of following features: (1) body with rounded prosomal somites, (2) 1-segmented abdomen, (3) caudal ramus with 6 elements, (4) inconspicuous leg 5, (5) chelate maxilliped with dactylus-receiving myxal process, (6) 8-segmented antennule without spine, (7) legs 1-4 with 2-segmented rami. The occurrence of E. alba is the first record from the Pacific Ocean and T. meyeni and D. akajei represent new host records for this species., A description of Dangoka japonica nov. gen. nov. sp. and a redescription of Eudactylinella alba Wilson, 1932 are given based on specimens recovered from the branchial lamellae of two Japanese guitarfishes, Rhinobatos schlegelii Müller & Henle, 1841 and R. hynnicephalus Richardson, 1846 (Rhinobatidae), and of two Japanese dasyatid rays, Taeniura meyeni Müller & Henle, 1841 and Daystis akajei (Müller & Henle, 1841) (Dasyatidae), respectively. D. japonica nov. gen. nov. sp. is easily distinguishable from all confamilial species in having in the female a combination of following features: (1) body with rounded prosomal somites, (2) 1-segmented abdomen, (3) caudal ramus with 6 elements, (4) inconspicuous leg 5, (5) chelate maxilliped with dactylus-receiving myxal process, (6) 8-segmented antennule without spine, (7) legs 1-4 with 2-segmented rami. The occurrence of E. alba is the first record from the Pacific Ocean and T. meyeni and D. akajei represent new host records for this species.]

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