Systematic Parasitology

, Volume 57, Issue 3, pp 229–235 | Cite as

A new species of Pseudanisakis Layman & Borovkova, 1926 (Nematoda: Ascaridida) from Rioraja agassizii and Psammobatis extenta (Rajidae) in Brazilian southwestern Atlantic waters

  • Cláudia Portes Santos
  • Herman Lent
  • David I. Gibson


Pseudanisakis sulamericana n. sp. is described from the intestines of the rays Rioraja agassizii and Psammobatis extenta off the coast of Brazil. It can be readily differentiated from the three existing species of the genus. From P. tricupola Gibson, 1973, it differs in not having cupolas on the lips, having a dentigerous ridge of 90–95 denticles (vs 65–78) in a continuous subtriangular ring around the mouth, and in having an ejaculatory duct which is shorter than the spicules. From P. rajae (Yamaguti, 1941), it differs in having a single rather than a double row of denticles. It appears most similar to P. baylisi Gibson, 1973, but differs from it in having a smaller body-size (7.5–27 vs 16–46 mm), shorter spicules (1.14–1.90 vs 1.90–3.80 mm) and especially in having much more conspicuous denticles on the lips. The present record confirms the presence of the genus in subtropical waters.


Atlantic Water Ejaculatory Duct Subtropical Water Present Record Short Spicule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Arthur, J.R. & Ahmed, A.T.A. (2002) Checklist of the parasites of fishes of Bangladesh. FAO Fisheries Technical Paper. Rome, 369, 1–77.Google Scholar
  2. Fagerholm, H.-P. (1991) Systematic implications of male caudal morphology in ascaridoid nematode parasites. Systematic Parasitology, 19, 215–228.Google Scholar
  3. Gibson, D.I. (1973) The genus Pseudanisakis Layman & Borovkova, 1926 (Nematoda: Ascaridida). Journal of Natural History, 7, 319–340.Google Scholar
  4. Gibson, D.I. (1983) The systematics of ascaridoid nematodes-a current assessment. In: Stone, A.R., Platt, H.M. & Khalil, L.F. (Eds) Concepts in nematode systematics. Systematic Association, Special Volume 22. London: Academic Press, pp. 321–338.Google Scholar
  5. Hartwich, G. (1957) Zur Systematik der nematoden-Superfamilie Ascaridoidea. Zoologische Jahrbücher. Abteiling für Systematik, 85, 211–252Google Scholar
  6. Hartwich, G. (1975) Keys to the genera of the Ascaridoidea. In: Anderson, R.C., Chabaud, A.G. & Willmott, S.W. (Eds) CIH keys to the nematode parasites of vertebrates. No. 2. Farnham Royal: Commonwealth Agricultural Bureau, 15 pp.Google Scholar
  7. Layman, E.M. & Borovkova, M.M. (1926) [Parasitic worms of the skate (Raja radiata Don.) from material of the 15th Federal Helminthological Expedition.] Raboty Parazitologicheskoi Laboratorii. Moskovskii Gosudarstvennyi Universitet, pp. 9–26. (In Russian).Google Scholar
  8. Nadler, S.A. & Hudspeth, D.S.S. (1998) Ribosomal DNA and phylogeny of the Ascaridoidea (Nemata: Secernentea): implications for morphological evolution and classification. Molecular Phylogenetics and Evolution, 10, 221–236.Google Scholar
  9. Petter, A.J., Paradiznik, V., Radujkovic, B.M. & Cassone, J. (1991) Redescription d'Acanthocheilus rotundatus (Ascaridoidea, Nematoda), parasite de requins (Pleurotremata, Selachii). Considérations sur les affinités du genre Acanthocheilus et conclusions taxonomiques. Annales de Parasitologie Humaine et Comparée, 66, 187–194.Google Scholar
  10. Soares, L.S.H., Rossi-Wongtschowski, C.L.B, Alvares, L.M.C., Muto, E.Y. & Gasalla, M.L.A. (1992) Grupos tróficos de peixes demersais da plataforma continental interna de Ubatuba, Brasil. I. Chondrichthyes. Boletim do Instituto Oceanográfico, São Paulo, 40, 79–85.Google Scholar
  11. Sprent, J.F.A (1983) Observations on the systematics of ascaridoid nematodes. In: Stone, A.R., Platt, H.M. & Khalil, L.F. (Eds) Concepts in nematode systematics. Systematic Association, Special Volume 22. London: Academic Press, pp. 303–319.Google Scholar
  12. Stehmann, M. & Burkel, D.L. (1984) Gnathostomata. Rajidae. In: Whitehead, P.J.P., Bauchot, M.L., Hureau, J.C., Nielsen, J. & Tortonese, E. (Eds) Fishes of the north-eastern Atlantic and the Mediterranean. Volume 1. Paris: UNESCO, pp. 212–215.Google Scholar
  13. Tanzola, R.D., Guagliardo, S.E., Brizzola, S.M., Arias, M.V. & Botte, S.E. (1998) Parasite assemblage of Sympterygia bonapartei (Pisces: Rajidae), an endemic skate of the Southwest Atlantic. Helminthologia, 35, 123–129.Google Scholar
  14. Van Thiel, P.H., Kuipers, F.C. & Roskam, R.T. (1960) A nematode parasitic to herring causing acute abdominal syndromes in man. Tropical and Geographical Medicine, 12, 97–113.Google Scholar
  15. Vassiliàdes, G. (1985) Helminthes parasites des poissons de mer des côtes du Sénégal. Bulletin de l'Institute Fondamental d'Afrique Noire, 44, 78–99.Google Scholar
  16. Williams, H.H. & Richards, D.H.H. (1968) Observations on Pseudanisakis rotundata (Rudolphi, 1819) Mosgovoi, 1950, a common but little known nematode parasite of Raia radiata Donovan in the northern North Sea. Journal of Helminthology, 42, 199–220.Google Scholar
  17. Yamaguti, S. (1941) Studies on the helminth fauna of Japan. Part 33. Nematodes of fishes, II. Japanese Journal of Zoology, 9, 343–396.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Cláudia Portes Santos
    • 1
  • Herman Lent
    • 1
  • David I. Gibson
    • 2
  1. 1.Departamento de BiologiaInstituto Oswaldo CruzRio de Janeiro, RJBrazil
  2. 2.Department of ZoologyThe Natural History MuseumLondonUK

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