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A new species of Cacatuocotyle is described from the external surface of Astyanax aff. fasciatus and Astyanax jacuhiensis from Lake Guaíba, State of Rio Grande do Sul, Brazil. It differs from the other three species of the genus, recorded from Mexico and the State of Paraná, Brazil, by possessing an accessory piece with a long proximal portion, a U-shaped bar with irregular posterior margin in its midportion, and a haptor containing two circular thickenings with muscular anterior margins. Only one monogenean species, Urocleidoides astyanacis (= Characithecium costaricensis) was recorded for the host Astyanax aff. fasciatus, whereas none were known for A. jacuhiensis. This paper records a new host (A. jacuhiensis) for monogeneans in southern Brazil and extends southward with the geographical distribution of the genus Cacatuocotyle to the State of Rio Grande do Sul, Brazil.
A new species of Kritskyia Kohn, 1990 (Monogenea, Dactylogyridae, Ancyrocephalinae) is described from the urinary bladder of Salminus brasiliensis (Cuvier, 1816) (Characiformes, Characidae) from the Cuiabá River, the Pantanal wetlands, Brazil. The male copulatory apparatus of the new species differs from those of other species of the genus by the presence of a bipartite accessory piece (distally and proximally linked), one part grooved, serving as guide for distal portion of the MCO. Moreover, the vagina of the new species differs from those of congeners by possessing distal digitiform processes.
Studies on the composition and distribution of fish species of the Ovwere Stream in the Niger Delta area of Southern Nigeria were conducted between March 1992 and February 1993. A total of 42 species was recorded, of which 29 occurred upstream while 35 and 37 species were represented in the mid and downstream respectively. The mormyrids, characids, cyprinodontids, and cichlids were the most common fish families. The climatic regimes and the flood from the river Ethiope affected the distribution of fishes of some families in the stream. More species were recorded during the rainy season than in the dry one. The different sections showed ichthyofaunal similarity with nearby sections showing higher indices of similarity than the distal ones.
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