Redescription of Pseudanuretes chaetodontis Yamaguti, 1936 (Copepoda, Siphonostomatoida, Caligidae) and description of some of its developmental stages, with a discussion on sexually dimorphic features in the genus

Abstract

Abstract Pseudanuretes chaetodontis Yamaguti, 1936 is redescribed based on both sexes, from specimens recovered from the branchial lamellae of Chaetodontoplus septentrionalis (Temminck & Schlegel, 1844) (Pisces, Pomacanthidae) in Japan. In addition, both sexes of copepodid V are described, as well as the free-living phase composed of two naupliar stages and the infective copepodid I stage, all reared from eggs, for the first time. Sexually dimorphic features found in the adult are discussed and it is pointed out herein that P. parvulus (Wilson, 1913) was described based on a copepodid V female specimen by that original author. Both sexes of the copepodid V exhibit sexually dimorphic features of the male type, i.e., in the maxilliped and in leg 5.