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Redescription of four species of Kroyeria and Kroeyerina (Copepoda, Siphonostomatoida, Kroyeriidae) infecting Japanese sharks

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Four known species of kroyeriids infecting two species of Japanese sharks are redescribed and illustrated, based on both sexes. These are Kroyeria sublineata Yamaguti & Yamasu, 1959 and K. elongata Pillai, 1967 obtained separately from branchial lamellae of the white smoothhound, Mustelus griseus Pietschmann, 1908; and K. carchariaeglauci Hesse, 1879 and Kroeyerina elongata Wilson, 1932 obtained from branchial and olfactory lamellae, respectively, of the blue shark, Prionace glauca (Linnaeus, 1758). The male and the fifth copepodid (male) of K. sublineata, and the fourth copepodid (female) of Kroeyerina elongata are described for the first time. Two of the forms here described, i.e., Kroyeria sublineata and Kroyeria elongata, are now considered valid species, although they had earlier been relegated to the synonymy of K. lineata Van Beneden, 1853 and K. spatulata Pearse, 1948, respectively. The records of Kroyeria elongata and Kroeyerina elongata are new for Japan. Mustelus griseus represents a new host record for Kroyeria elongata and K. sublineata. The presence of postantennal processes was verified in both sexes of all species dealt with here. The process is papilliform, with an orifice of a duct at the tip, and presumably functions as some exocrine gland. A plesiomorphic feature found in the eudactylinid-kroyeriid complex is discussed. Quatre espèces connues de copépodes Kroyeriidae infectant deux espèces de requins japonais sont redécrites et illustrées, à partir des deux sexes. Ce sont Kroyeria sublineata Yamaguti & Yamasu, 1959 et K. elongata Pillai, 1967, obtenus séparément sur des lamelles branchiales de l'émissole côtière Mustelus griseus Pietschmann, 1908; et K. carchariaeglauci Hesse, 1879 et Kroeyerina elongata Wilson, 1932 prélevées sur les lamelles branchiales et olfactives, respectivement, du requin bleu Prionace glauca (Linnaeus, 1758). Le mâle et le cinquième copépodite (mâle) de K. sublineata, ainsi que le quatrième copépodite (femelle) de Kroeyerina elongata sont décrits pour la première fois. Deux des formes ici décrites, Kroyeria sublineata et Kroyeria elongata, sont maintenant reconnues comme espèces valides, bien que elles aient été auparavant considérées comme synonymes de K. lineata Van Beneden, 1853 et de K. spatulata Pearse, 1948, respectivement. Les mentions de Kroyeria elongata et Kroeyerina elongata sont nouvelles pour le Japon. Mustelus griseus constitue un nouvel hôte pour Kroyeria elongata et K. sublineata. La présence de processus post-antennaires a été vérifiée chez les deux sexes de toutes les espèces étudiées ici. Le processus est papilliforme, présentant un débouché de canal à l'extrémité, et présumé fonctionnant comme une glande exocrine. Un caractère plésiomorphe, mis en évidence dans le complexe Eudactylinidae-Kroyeriidae est discuté.

Affiliations: 1: Izawa Marine Biological Laboratory, 795-16 Kannonji, Tsu, Mie 514-0062, Japan


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