Uma nova espécie de Cosmetocleithrum das brânquias de Auchenipterichthys coracoideus da Amazônia peruana
Keywords:
Auchenipterid, Ectoparasite, Iquitos, Monogenoids, TaxonomyAbstract
Among the fish species belonging to Auchenipteridae, fourteen species of monogenoids were reported. To date, one species of auchenipterid has been reported in Peru as a monogenoid host. Fish were obtained in July 2019 from the, the Pintuyacu stream, which is an affluent of the Itaya River, in Iquitos, Peru. Specimens were prepared on slides using Hoyer’s medium to clarify soft tissues and allows better visualization of the sclerotized pieces. Other specimens were stained with Gomori’s trichrome and prepared in Canada balsam to determine internal structures. A new species of Cosmetocleithrum Kritsky, was found parasitizing the gills of Auchenipterichthys coracoideu. Cosmetocleithrum amazonensis n. sp. can be distinguished from all other congeneric species by possessing an elongated and sclerotized male copulatory organ (MCO), and sinuous tube with poorly defined coils, base with a sclerotized border, and distal region lying on the accessory piece. The accessory piece is a single and robust plate, which is not articulated with the MCO. Thus, this study presents the second record of a species of monogenoid in an auchenipterid host from Peru.
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