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Orientatractis moraveci n. sp. and Rondonia rondoni Travassos, 1920 (Nematoda: Atractidae), parasites of Pimelodus blochii (Osteichthyes, Pimelodidae) from the Acre and Xapuri Rivers, Western Amazon, Brazil

Published online by Cambridge University Press:  17 October 2016

PEDRO H. O. CAVALCANTE ,
MARALINA T. SILVA ,
EVERTON G. N. SANTOS ,
VANESSA A. CHAGAS-MOUTINHO  and
CLAUDIA P. SANTOS Open the ORCID record for CLAUDIA P. SANTOS [Opens in a new window]
PEDRO H. O. CAVALCANTE
Affiliation:
Instituto Federal do Acre – IFAC, Xapuri, AC, Brazil Programa de Pós-Graduação em Biodiversidade e Saúde, Instituto Oswaldo Cruz, Fiocruz
MARALINA T. SILVA
Affiliation:
Programa de Pós-Graduação em Biodiversidade e Saúde, Instituto Oswaldo Cruz, Fiocruz Instituto Federal do Acre – IFAC, Rio Branco, AC, Brazil
EVERTON G. N. SANTOS
Affiliation:
Laboratório de Avaliação e Promoção da Saúde Ambiental, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil Fundação Instituto de Pesca do Estado do Rio de Janeiro – FIPERJ, Escritório Regional Metropolitano II, Rua Aílton da Costa, 115, sl. 606 – Vinte Cinco de Agosto, Duque de Caxias – RJ, 25071-160
VANESSA A. CHAGAS-MOUTINHO
Affiliation:
Laboratório de Avaliação e Promoção da Saúde Ambiental, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil
CLAUDIA P. SANTOS*
Affiliation:
Laboratório de Avaliação e Promoção da Saúde Ambiental, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil
*
*Corresponding author: Laboratório de Avaliação e Promoção a Saúde Ambiental, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil, 4.365, Manguinhos, Rio de Janeiro, 21040-360, Brazil. E-mail: [email protected]
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Summary

The fish fauna in the State of Acre represents 10·7% of all fish species recorded from Brazil, but, despite this, there are few fish parasite studies in this area. The recent expansion of fish farming in Acre prompted a need for helminthological studies of the most commonly consumed fish species in the area, Pimelodus blochii (Pimelodidae). The aim of this study was to analyse the helminth fauna of P. blochii from the Acre and Xapuri Rivers in Northwestern Brazil. Numerous nematodes were collected from the intestine and two species of the family Atractidae were identified: Rondonia rondoni Travassos, 1920 and Orientatractis moraveci n. sp. The new species is distinguished from its congeners mainly by having: 10 pairs of caudal papillae (3 pairs pre-cloacal, 2 pairs ad-cloacal and 5 pairs post-cloacal); unequal spicules of 161–198 and 69–100 µm long; and a gubernaculum 38–58 µm long with an antero-lateral process. Morphological and ultrastructural data on O. moraveci n. sp. and R. rondoni are presented, in addition to new genetic data based on partial 18S rDNA and 28S rDNA. The taxonomic status of Labeonema synodontisi (Vassiliadès, 1973) is discussed, suggesting that it should be returned to the genus Raillietnema.

Keywords

NematodaCosmocercoideaAtractidaeBrazilscanning electron microscopy18S rDNA28S rDNA
Type
Research Article
Information
Parasitology , Volume 144 , Issue 2 , February 2017 , pp. 226 - 236
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Copyright
Copyright © Cambridge University Press 2016 

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