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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.15 no.4 Curitiba Dec. 1998 

Neoechinorhynchus pimelodi sp.n. (Eoacanthocephala, Neoechinorhynchidae) parasitizing Pimelodus maculatus Lacépède, "mandi-amarelo" (Siluroidei, Pimelodidae) from the basin of the São Francisco river, Três Marias, Minas Gerais, Brazil





Marília de Carvalho Brasil-SatoI; Gilberto Cezar PavanelliII

IDepartamento de Biologia Animal, Universidade Federal Rural do Rio de Janeiro. Caixa Postal 74539, 23851-970 Seropédica, Rio de Janeiro, Brasil
IIDepartamento de Biologia, Núcleo de Pesquisa em Limnología, Ictiología e Aquicultura, Universidade Estadual de Maringá. 87020-900 Maringá, Paraná, Brasil




Neoechinorhynchus pimelodi sp.n. is described as the first record of Acanthocephala in Pimelodus maculatus Lacépède. 1803, collected in the São Francisco river, Três Marias, Minas Gerais. The new species is distinguished from other of the genus by the three circles of hooks of different sizes, and by the eggs measurements. The hooks measuring 100-1 12 (105), 32-40 (36) and 20-27 (23) in length in the males and 102-142 (129), 34-55 (47) and 27-35 (29) in length in the females for the anterior, middle and posterior circles. The eggs measuring 15-22 (18) in length and 12-15 (14) in width, with concentric layers of texture smooth, enveloping the acanthor.

Key words: Acanthocephala, Neoechinorhynchidae, Neoechinorhynchus pimelodi sp.n., Pimelodus maculatus, São Francisco river, Brazil.



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ACKNOWLEDGEMENTS. The authors wish to thank the biologist Yoshimi Sato, CODE-VASF, Três Marias, Minas Gerais, Brazil, for the collection and identification of the hosts, and CODEVASF for logistic support during the study. Thanks are also due to Dr. James C. Chubb and Mr. C. J. Veltkamp, University of Liverpool, Liverpool, England, for the SEM photograph, to Dr. Celso Magalhães, curator of the Invertebrate Collection of INPA, Amazonas, Brazil, for the loan of the paratypes examined, to Dr. J. Ralph Lichtenfels, United States Department of Agriculture, Beltsville, Maryland, USA, for the loan of voucher specimens and for depositing type specimens at USNPC, and to Dr. Dely Noronha, Heiminthologic Collection of FIOCRUZ. Rio de Janeiro, Brazil, for depositing type specimens.



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Recebido em 01.VIII.1998; aceito em 24.XI.1998.

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