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Morphology and molecular phylogeny of Chauhanellus Bychowsky & Nagibina, 1969 (Monogenoidea) parasitizing marine catfish (Ariidae) from the Atlantic coast of South America: a new species, supplementary taxonomic information and new insights

Published online by Cambridge University Press:  24 March 2023

G.B. Soares*
Affiliation:
Programa de Pós-graduação em Biologia Animal, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Rua Monteiro Lobato, 255, CEP 13083-862 Campinas, São Paulo, Brazil
M.F. Martins
Affiliation:
Programa de Pós-graduação em Biologia de Ambientes Aquáticos Continentais, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Avenida Itália km 8, CEP 96203-900, Rio Grande, Rio Grande do Sul, Brazil
R.T. Vianna
Affiliation:
Programa de Pós-graduação em Biologia de Ambientes Aquáticos Continentais, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Avenida Itália km 8, CEP 96203-900, Rio Grande, Rio Grande do Sul, Brazil
M.V. Domingues
Affiliation:
Programa de Pós-graduação em Biologia Ambiental, Instituto de Estudos Costeiros, Universidade Federal do Pará (UFPA), Travessa Leandro Ribeiro, s/n, Aldeia, CEP 68600-000 Bragança, Pará, Brazil
E.A. Adriano
Affiliation:
Programa de Pós-graduação em Biologia Animal, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Rua Monteiro Lobato, 255, CEP 13083-862 Campinas, São Paulo, Brazil Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Paulo (UNIFESP), Rua Professor Arthur Riedel, 275, Jardim Eldorado, CEP 09972-270 Diadema, São Paulo, Brazil
*
Author for correspondence: G.B. Soares, E-mail: geusivansoares@gmail.com

Abstract

In this study, a new dactylogyrid species is described from the gills of two ariid fish species of the Brazilian coast, Genidens barbus and Genidens genidens, by combining morphological characters with partial 18S rDNA sequences. The new species can be distinguished from its congeners by the following morphological characteristics: a male copulatory organ (MCO), a coiled tubular shaft of around one counterclockwise ring, base with a sclerotized cap; MCO with tapered distal region; a T-shaped accessory piece; a vagina, a cup-shaped vaginal vestibule, slightly sclerotized; and a pharynx comprising a muscular, glandular bulb. Supplementary taxonomic data for Chauhanellus velum from Sciades couma (type-host) are also presented and new 18S rDNA sequences of Chauhanellus spp. from other ariid fish from South America are provided. Phylogenetic analyses based on partial 18S rDNA gene sequences placed Chauhanellus riograndinensis n. sp. and Chauhanellus velum as two early divergent lineages within Chauhanellus from South America. Finally, a way to test the monophyly of Chauhanellus and Hamatopeduncularia is also discussed, which may be useful for future studies.

Type
Research Paper
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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