Three new species of Monogenea (Platyhelminthes) parasites of fish in the Guandu river, southeastern Brazil

Rodney Kozlowiski de Azevedo,José Luis Fernando Luque,Vanessa Doro Abdallah

doi:10.4025/actascibiolsci.v34i4.10466

Rodney Kozlowiski de Azevedo, José Luis Fernando Luque

Open Access

https://doi.org/10.4025/actascibiolsci.v34i4.10466

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Abstract

Current essay describes three new Monogenean species, namely, Cosmetocleithrum striatuli sp. nov., Jainus leporini sp. nov. and Rhabdosynochus guanduensis sp. nov., parasites on the gills of Trachelyopterus striatulus (Steindachner, 1877), Leporinus copelandii Steindachner, 1875 and Centropomus undecimalis (Bloch, 1792), respectively. Fish were collected from the Guandu river, State of Rio de Janeiro, Brazil between August 2005 and November 2008. Cosmetocleithrum striatuli sp. nov. differs from all other congeneric species by the shape of an accessory piece (more robust and resembling a crustacean claw or chela) and by the shape of its ventral and dorsal bars (not V-shaped and with expanded lateral ends directed to the rear). Jainus leporini sp. nov. differs from all other Jainus species by the male copulation organ (MCO), with a 2-ring coil, by the absence of medial projection on ventral bar and by a plate-like sclerotized structure associated to the vagina. Rhabdosynochus guanduensis sp. nov. differs from all other congeneric species by the morphology of the copulation complex and by a shell-shaped vagina.

Highlights

Despite the efforts of taxonomists, the diversity of the Monogenea in neotropical waters is still largely unknown (BOEGER; VIANNA, 2006) and further efforts to carry out studies on their biodiversity are relevant
This paper provides the description of three new species of Monogenea from the Guandu river, or rather, Cosmetocleithrum striatuli sp. nov., Jainus leporini sp. nov. and Rhabdosynochus guanduensis sp. nov. parasitizing the gills of Trachelyopterus striatulus (Steindachner, 1877), Leporinus copelandii Steindachner, 1875 and Centropomus undecimalis (Bloch, 1792) respectively
The new species differs from J. amazonensis by accessory piece not flabellate distally, by a vagina associated to plate-like sclerotized structure and by possessing a coiled male copulation organ comprising 2 rings

Summary

Introduction

Despite the efforts of taxonomists, the diversity of the Monogenea in neotropical waters is still largely unknown (BOEGER; VIANNA, 2006) and further efforts to carry out studies on their biodiversity are relevant. Material and methods Sixty specimens of cumbaca (T. striatulus), of piau (L. copelandii) and of robalo (C. undecimalis) were collected between August 2005 and November 2008 from the Guandu river (22°48'32"S; 43o37'35"W), State of Rio de Janeiro, Brazil, to study the abovementioned monogenean species.

Results

Conclusion