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ARCHIDACTYLINAMYXINICOLA, NEW GENUS, NEW SPECIES (SIPHONOSTOMATOIDA), IN A NEW FAMILY OF COPEPODA PARASITIC ON HAGFISHES (AGNATHA: MYXINIFORMES) FROM JAPAN

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ABSTRACT A parasitic copepod, Archidactylina myxinicola, new genus, new species (Siphonostomatoida: Archidactylinidae, new family), is described based on specimens of both sexes obtained from the gill pouches of hagfishes (Agnatha: Myxiniformes) collected from the continental slopes of the Sea of Kumano, Japan. This is the first record of parasitic copepods from Agnatha. Although this new taxon generally exhibits eudactylinid facies, it apparently possesses more primitive features than those found in the Eudactylinidae. This new siphonostomatoid is characterized by possessing the following features: (1) a sternal suture on the cephalothorax between the maxillipedal and the first pedigerous somites; (2) incomplete prosome-urosome differentiation; (3) a free genital somite; (4) ventral copulatory pores isolated from the lateral genital apertures in the female; (5) no cuticular ornamentation characteristic of the eudactylinids; (6) an indistinctly 18-segmented antennule in both sexes, geniculate bilaterally in the male; (7) uniramous, 5-segmented antenna; (8) maxilliped on a discrete pedestal and lacking myxal process on the corpus; and (9) a setation formula of 111,1,5 on the third exopodal segment of legs 2-4 of both sexes.

10.1163/193724096X00199
/content/journals/10.1163/193724096x00199
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/content/journals/10.1163/193724096x00199
2017-10-24

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