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Issue: Vol. 4700 No. 2: 19 Nov. 2019
Type: Article
Published: 2019-11-19
DOI: 10.11646/zootaxa.4700.2.3
Page range: 229–245
Abstract views: 85
PDF downloaded: 4

Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil

Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros; Travessa Leandro Ribeiro, s/n, bairro Aldeia, 68600-000, Bragança, Pará, Brasil Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará
Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará
Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará
Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará
Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará
Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros; Travessa Leandro Ribeiro, s/n, bairro Aldeia, 68600-000, Bragança, Pará, Brasil
Laboratório de Sistemática e Coevolução, Universidade Federal do Pará, Campus Universitário de Bragança, Instituto de Estudos Costeiros; Travessa Leandro Ribeiro, s/n, bairro Aldeia, 68600-000, Bragança, Pará, Brasil Programa de Pós-Graduação em Biologia Ambiental, Universidade Federal do Pará Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará
Platyhelminthes Amazon Characiformes Hydrolycus armatus Monogenoidea Mymarothecioides Rhinoxenus

Abstract

One new species of Rhinoxenus Kritsky, Boeger & Thatcher, 1988 from the nasal cavities and four new species of Mymarothecioides n. gen. from the gills are described in Hydrolycus armatus (Jardine & Schomburgk). They were collected in the Xingu River, Pará, Brazil. Rhinoxenus cachorra n. sp. is characterized by having a ventral anchor with inconspicuous roots, and point with fish-hook-like termination; copulatory complex comprising a spiraled male copulatory organ (MCO) with two counterclockwise coils, and an accessory piece with an expanded, bifurcated distal portion. Mymarothecioides n. gen. is proposed and characterized for species without eyes, with or without accessory chromatic granules; copulatory complex comprising articulated MCO, accessory piece; MCO a broad arcuate tube; an accessory piece with a hooked termination in the distal portion; a dextro or midventral non-sclerotized vagina; an anteromedial projection on the ventral bar. Mymarothecium whittingtoni Kritsky, Boeger & Jégu, 1996 is transferred to Mymarothecioides n. gen. as Mymarothecioides whittingtoni (Kritsky, Boeger & Jégu, 1996) n. comb.

 

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