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Molecular phylogeny of Cosmetocleithrum Kritsky, Thatcher & Boeger, 1986 (Monogenoidea: Dactylogyridae), gill parasites of Neotropical catfishes (Siluriformes)

Published online by Cambridge University Press:  28 July 2022

C.A. Mendoza-Palmero Open the ORCID record for C.A. Mendoza-Palmero [Opens in a new window] ,
A.A. Acosta  and
T. Scholz
C.A. Mendoza-Palmero*
Affiliation:
Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, České Budějovice 37005, Czech Republic
A.A. Acosta
Affiliation:
Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom campus, Potchefstroom 2520, South Africa
T. Scholz
Affiliation:
Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, České Budějovice 37005, Czech Republic
*
Author for correspondence: C.A. Mendoza-Palmero, E-mail: [email protected]
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Abstract

Cosmetocleithrum Kritsky, Thatcher & Boeger, 1986 (Dactylogyridae) represents one of the most species-rich groups (22 species currently recognized as valid) of all dactylogyrid parasites infecting Neotropical catfishes. Species of Cosmetocleithrum exhibit a remarkable affinity towards catfishes of the Doradidae and the Auchenipteridae. However, phylogenetic relationships between members of this genus have not been yet analysed. This study analysed newly obtained partial sequences of the 28S ribosomal RNA gene of seven species of Cosmetocleithrum, including its type species C. gussevi Kritsky, Thatcher & Boeger, 1986, along with several other dactylogyrids infecting siluriform, gymnotiform, perciform and characiform fishes. Cosmetocleithrum appeared as an evolutionary recent group, composed of two well-defined lineages: lineage 1 includes parasites of doradids – namely, C. bulbocirrus, C. confusum, C. parvum and C. bifurcum – whereas lineage 2 is composed of species from doradids – that is, C. rarum, C. gussevi, C. gigas, C. trachydorasi and C. falsunilatum – together with parasites of auchenipterids – namely, C. laciniatum and C. baculum. The search for synapomorphies to characterize taxonomic groups within Cosmetocleithrum appears challenging, since the morphology of their haptoral elements is quite conservative, and that of the copulatory complex is highly variable between species. The results of the present study support the recent synonymization of Paracosmetocleithrum Acosta, Scholz, Blasco-Costa, Alves & Silva, 2018 with Cosmetocleithrum. Whereas the 28S ribosomal DNA data resolved Cosmetocleithrum as monophyletic, the statistical support for the lineage was low, rendering its phylogenetic position between other Neotropical dactylogyrids yet undefined.

Keywords

CosmetocleithrumDactylogyridaeSiluriformes28s rRNA genemolecular phylogeny
Type
Research Paper
Information
Journal of Helminthology , Volume 96 , 2022 , e56
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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