Abstract
Two species of Caballerocotyla from scombrids from Atlantic Ocean, Rio de Janeiro coast, Brazil are described: Caballerocotyla llewelyni n. sp. from gills of Katsuwonus pelamis and Caballerocotyla neothunni, from Thunnus albacares. Caballerocotyla neothunni is reported for the first time in South America. Caballerocotyla llewelyni n. sp. is most similar to Caballerocotyla foliacea, Caballerocotyla gregalis, and Caballerocotyla nozawae by lacking marginal spines and by the presence of a sessile haptor. The new species differs from Caballerocotyla foliacea, mainly by its smaller number of testes and by the presence of “cuticular” papillae on the haptor; it differs from Caballerocotyla gregalis by the haptor/body length ratio, by shape of anchors and haptor with “cuticular” papillae; and it differs from Caballerocotyla nozawae, mainly by its smaller haptor and smaller number of testes. There was no morphological differences between the descriptions of Caballerocotyla neothunni and Caballerocotyla abidjani (parasites of Thunnus albacares) when compared to our specimens of C. abidjani (also collected from T. albacares). We propose Caballerocotyla abidjani as a synonym of Caballerocotyla neothunni.Key words: Brazil, Caballerocotyla, Caballerocotyla llewelyni n. sp., Capsalidae, marine fish parasites, Monogenea, TunaReferences
Bussieras, J. (1972) Les Monogènes Capsalinae parasites des thons de l´Atlantique tropical oriental. Annales de Parasitologie, 47, 29–49.
Bussiéras, J. & Baudin-Laurencin, F. (1973) Les helminthes parasites des thons tropicaux. Revue d Elevage et de Medecine Veterinaire des Pays Tropicaux, 26,13–19.
Egorova, T. P. (1989) A taxonomic analyses of the subfamily Capsalinae (Monogenoidea: Capsalidae). In: Investigations in parasitology. Collection of papers. Ed. Far. East Branch of the URSS, Academic of Sciences, 46–54.
Kardousha, M. M. (2002) Descriptions of three Capsala spp. (Capsalidae) including Capsala naffari n. sp. infecting mackerel tuna Euthynnus affinis from coasts of Emirates. Parasitology International, 51, 327–335.
Lamothe-Argumedo, R. (1997) Nuevo arregolo taxonómico de la subfamilia Capsalinae (Monogenea:Capsalidae), clave para los géneros y dos combinaciones nuevas. Anales del Instituto de Biologia Universidad Nacional Autonoma de Mexico, Serie Zoologia, 68,207–223.
Luque & Iannacone, J. (1991) Some Monogenoidea parasitic on Peruvian marine fishes, with description of Anoplocotyloides chorrillensis new species and new records. Memórias do Instituto Oswaldo Cruz,1, 425–428.
Oliva, M. (1986) Monogenea in marine fishes from Antofagasta, Chile, with description of Caballerocotyla australis n. sp. (Capsalidae). Revista Chilena de Historia Natural, 559, 87–94.
Price, E. W. (1960) The giant marlin, Makiara marlina Jordan and Evermann, a new host for Capsala pricei Hidalgo, 1959, with a review of the subfamily Capsalinae. In Libro Homenage al Doctor Eduardo Caballero y Caballero, pp. 237–244.
Wagner, D. E & Carter, C. E. (1967) Caballerocotyla gregalis sp. n. (Trematoda: Monogenea) from the gills of Sarda lineolata (Girard). The Journal of Parasitology, 53, 277–279.
Whittington, I. D. (2004) The Capsalidae (Monogenea: Monopisthocotylea): a review of diversity, classification and phylogeny with a note about species complexes. Folia Parasitologica, 51, 109–122.
Yamaguti S (1963). Monogenea and Aspidocotylea. Vol. IV. Interscience Publishers, 381 pp.
Yamaguti S (1968). Monogenetic trematodes of Hawaiian fishes. University of Hawaii Press, Honolulu, 288 pp.