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Monogenoidean parasites of Acestrorhynchus falcatus (Characiformes: Acestrorhynchidae) from Pará, Brazil: species of Diaphorocleidus and Rhinoxenoides n. gen. (Monogenoidea: Dactylogyridae)

Published online by Cambridge University Press:  07 February 2018

J.F. Santos Neto ,
N.G.S. Costa ,
G.B. Soares  and
M.V. Domingues
J.F. Santos Neto
Affiliation:
Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros, Alameda Leandro Ribeiro s/n., 68600-000, Bragança, Pará, Brazil Programa de Pós-Graduação em Biologia Ambiental, Universidade Federal do Pará
N.G.S. Costa
Affiliation:
Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros, Alameda Leandro Ribeiro s/n., 68600-000, Bragança, Pará, Brazil
G.B. Soares
Affiliation:
Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros, Alameda Leandro Ribeiro s/n., 68600-000, Bragança, Pará, Brazil Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará, Campus Universitário de Altamira
M.V. Domingues*
Affiliation:
Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros, Alameda Leandro Ribeiro s/n., 68600-000, Bragança, Pará, Brazil Programa de Pós-Graduação em Biologia Ambiental, Universidade Federal do Pará Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará, Campus Universitário de Altamira
*
Author for correspondence: M.V. Domingues, E-mail: mvdomingues@ufpa.br
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Abstract

Two new species of Diaphorocleidus and one new species of Rhinoxenoides n. gen. are described from the gills of Acestrorhynchus falcatus (Bloch) from rivers of north-eastern Pará, Brazil. Diaphorocleidus jaymedeloyolai n. sp. is characterized by a male copulatory organ (MCO) possessing three counterclockwise coils; similar anchors with subtriangular superficial roots; a ventral bar with posteromedial projection; and hooks of pairs 1, 4 and 7 approximately three times longer than hook pair 5. Diaphorocleidus sclerocolpus n. sp. differs from its congeners by a dual-branched accessory piece articulated with the MCO and a sclerotized tubular vagina with a bottle-shaped vestibule. Rhinoxenoides n. gen. is proposed and is characterized by possessing: MCO sclerotized with clockwise coils; an accessory piece articulated to the base of MCO; a sinistroventral vaginal aperture; ventral anchor with conspicuous roots; dorsal anchor with superficial root five times longer than deep root; and absence of dorsal bar. The proposal of Rhinoxenoides n. gen. is also supported by its phylogenetic relationship with Protorhinoxenus prochilodi and species of Rhinoxenus, using 16 morphological characters, which resulted in the following hypothesis of sister-group relationships: Rhinoxenoides n. gen. [Protorhinoxenus (Rhinoxenus curimatae (R. nyttus (R. bulbovaginatus (R. guianensis, R. piranhus, R. euryxenus (R. arietinus, R. anaclaudiae)))))].

Type
Research Paper
Information
Journal of Helminthology , Volume 93 , Issue 2 , March 2019 , pp. 208 - 219
Copyright
Copyright © Cambridge University Press 2018 

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