Redescription of Eight Species of Parasitic Copepods (Siphonostomatoida, Pandaridae) Infecting Japanese Elasmobranchs

[Eight species of pandarid copepods are redescribed based on specimens recovered from six species of Japanese elasmobranchs. These are Pandarus cranchii Leach, 1819, P . smithii Rathbun, 1886, Gangliopus pyriformis Gerstaecker, 1854, Pseudopandarus gracilis Kirtisinghe, 1950, Dinemoura latifolia (Steenstrup & Lutken, 1861), Echthrogaleus coleoptratus (Guerin-Meneville, 1837), E . denticulatus Smith, 1874, and Nesippus orientalis Heller, 1868. In P . cranchii , both sexes of copepodid IV and V are described, one of them retains the frontal filament. The postnaupliar juveniles preceding the adult are referred to here as copepodid stages instead of chalimus. The presence of the postantennal process was verified in all species here dealt with, though it is replaced by an additional adhesion pad in D . latifolia . The depression, seemingly acting as the sucker, was found in N . orientalis on the female leg 3 basis. Huit especes de copepodes Pandaridae sont redecrits a partir de specimens preleves chez six especes d'Elasmobranches, au Japon. Ce sont: Pandarus cranchii Leach, 1819, P . smithii Rathbun, 1886, Gangliopus pyriformis Gerstaecker, 1854, Pseudopandarus gracilis Kirtisinghe, 1950, Dinemoura latifolia (Steenstrup & Lutken, 1861), Echthrogaleus coleoptratus (Guerin-Meneville, 1837), E . denticulatus Smith, 1874 et Nesippus orientalis Heller, 1868. Chez P . cranchii , les copepodites IV et V des deux sexes sont decrits, l'un d'entre eux presente le filament frontal. Les juveniles post-naupliens precedant l'adulte sont consideres ici comme des stades copepoditiques plutot que comme des stades chalimus. La presence du processus post-antennaire a ete verifiee chez toutes les especes etudiees ici, bien qu'il soit remplace par un coussinet adhesif additionnel chez D. latifolia . La depression, agissant apparemment comme une ventouse a ete observee chez N . orientalis sur le basis de la troisieme patte de la femelle. , Eight species of pandarid copepods are redescribed based on specimens recovered from six species of Japanese elasmobranchs. These are Pandarus cranchii Leach, 1819, P . smithii Rathbun, 1886, Gangliopus pyriformis Gerstaecker, 1854, Pseudopandarus gracilis Kirtisinghe, 1950, Dinemoura latifolia (Steenstrup & Lutken, 1861), Echthrogaleus coleoptratus (Guerin-Meneville, 1837), E . denticulatus Smith, 1874, and Nesippus orientalis Heller, 1868. In P . cranchii , both sexes of copepodid IV and V are described, one of them retains the frontal filament. The postnaupliar juveniles preceding the adult are referred to here as copepodid stages instead of chalimus. The presence of the postantennal process was verified in all species here dealt with, though it is replaced by an additional adhesion pad in D . latifolia . The depression, seemingly acting as the sucker, was found in N . orientalis on the female leg 3 basis. Huit especes de copepodes Pandaridae sont redecrits a partir de specimens preleves chez six especes d'Elasmobranches, au Japon. Ce sont: Pandarus cranchii Leach, 1819, P . smithii Rathbun, 1886, Gangliopus pyriformis Gerstaecker, 1854, Pseudopandarus gracilis Kirtisinghe, 1950, Dinemoura latifolia (Steenstrup & Lutken, 1861), Echthrogaleus coleoptratus (Guerin-Meneville, 1837), E . denticulatus Smith, 1874 et Nesippus orientalis Heller, 1868. Chez P . cranchii , les copepodites IV et V des deux sexes sont decrits, l'un d'entre eux presente le filament frontal. Les juveniles post-naupliens precedant l'adulte sont consideres ici comme des stades copepoditiques plutot que comme des stades chalimus. La presence du processus post-antennaire a ete verifiee chez toutes les especes etudiees ici, bien qu'il soit remplace par un coussinet adhesif additionnel chez D. latifolia . La depression, agissant apparemment comme une ventouse a ete observee chez N . orientalis sur le basis de la troisieme patte de la femelle. ]