Abstract
Three new oxyuroid nematode species of the family Pharyngodonidae are described from the intestine of freshwater catfishes in Brazil (River Paraná), two of them being representatives of new monotypic genera: Ichthyouris brasiliensis n. sp. from Pterygoplichthys aculeatus, Brasilnema pimelodellae n. g., n. sp. from Pimelodella gracilis, and Parasynodontisia petterae n. g., n. sp. from Rhinelepis aspera. I. brasiliensis n. sp. differs from the only other congeneric species, I. ro, mainly in the absence of a pair of plate-like structures in the male caudal region, shorter caudal alae, the presence of a pair of conspicuous lateral spines at the level of the anal opening in the female and by other features. Brasilnema n. g. is characterised mainly by a hexagonal oral opening, a broad buccal capsule containing three teeth, a simple spicule and an amphidelphic uterus, whereas Parasynodontisia n. g. is characterised by a triangular oral opening and an amphidelphic uterus in the female; both genera possess six small, triangular, circumoral lamellae slightly raised above the apical surface. The paper includes a key to the pharyngodonid genera whose species are parasitic in fishes.
Similar content being viewed by others
References
Gupta, S.P. & Naqvi, N.H. (1984) Nematode parasites. I. Cosmoxynemoides indica sp. nov. from a freshwater fish Callichorous pabda from Lucknow. Indian Journal of Helminthology, 36, 68–72.
Inglis, W.G. (1962) Ichthyouris ro gen. et sp. nov. (Nematoda): an oxyurid from a freshwater fish. Journal of Helminthology, 36, 45–50.
Osorio-Sarabia, D. (1984) Descripción de una especie nueva del género Laurotravassoxyuris Vigueras, 1938 (Nematoda: Syphaciidae) en peces de agua dulce de México. Anales de Instituto de Biología de Universidad Nacional Autónoma de México, Ser. Zool., 54, 23–33.
Petter, A.J. & Quentin, J.-C. (1976) Keys to genera of the Oxyuroidea. In: Anderson, R.C. et al. (Eds) CIH keys to the nematode parasites of vertebrates. Farnham Royal: Commonwealth Agricultural Bureaux, No. 4, 30 pp.
Petter, A.J., Vassiliades, G. & Troncy, P.-M. (1972) Trois espèces d'oxyures parasites de poissons en Afrique. Annales de Parasitologie Humaine et Comparée, 47, 569–579.
Sood, M.L. (1972) Two rare oxyurid nematode parasites from fresh water fishes of India. Zoologischer Anzeiger, 188, 106–109.
Sood, M.L. & Agrawal, V. (1970) On two nematode parasites of fishes from Lucknow. Proceedings of the Indian Science Congress Association. Part III, p. 462.
Travassos, L. (1949) Contribuicao ao conhecimento da fauna helmintológica dos peixes de água doce do Brasil. IV. Dois novos generos de Cosmocercidae (Nematoda) e uma nota helmintológica. Memorias do Instituto Oswaldo Cruz, 46, 633–637.
Vicente, J.J., Rodrigues, H.O. & Gomes, D.C. (1985) Nematóides do Brasil. 1a. Parte: Nematóides de peixes. Atas da Sociedade de Biologia do Rio de Janeiro, 25, 1–79.
Vigueras, P.I. (1938) Nota sobre algunos nematodes parásitos nuevos de Cuba. Livro Jubilar Prof. Lauro Travassos, Rio de Janeiro, Brasil, III, 501–508.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Moravec, F., Kohn, A. & Fernandes, B.M.M. Three new species of oxyuroid nematodes, including two new genera, from freshwater catfishes in Brazil. Syst Parasitol 21, 189–201 (1992). https://doi.org/10.1007/BF00009699
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00009699