ArticleSystematic parasitology2025
Dactylogyrids (Platyhelminthes: Monogenoidea) from the gills of Pygocentrus nattereri and Serralsamus rhombeus (Characiformes: Serrasalmidae) from the State of Maranhão, Brazil, with the description of a new species of Anacanthorus.
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Abstract
The present study aimed to report monogenoids parasitizing the gills of two species of piranhas from the state of Maranhão, Brazil: Pygocentrus nattereri Kner, and Serrasalmus rhombeus (Linnaeus). Fifty specimens of P. nattereri were caught in the Lake "Grande" in the municipality of São Bento, and 50 specimens of S. rhombeus were caught in the main channel of the Pericumã River, municipality of Pinheiro. Fourteen species of dactylogyrids were found parasitizing the gills of P. nattereri and S. rhombeus. Of the 14 species identified, 11 were found in P. nattereri: Amphitecium calycinum Boeger & Kritsky, 1988, Amphitecium camelum Boeger & Kritsky, 1988; Amphitecium falcatum Boeger & Kritsky, 1988; Amphitecium junki Boeger & Kritsky, 1988; Amphithecium sp.; Anacanthorus sp. 1; Anacanthorus jegui Van Every & Kritsky, 1992; Anacanthorus mesocondylus Van Every & Kritsky, 1992; Anacanthorus reginae Boeger & Kritsky, 1988; Anacanthorus sciponophallus Van Every & Kritsky, 1992 and Anacanthorus thatcheri Boeger & Kritsky, 1992. Five species were found in S. rhombeus: Am. calycinum; Am. falcatum; Anacanthorus amazonicus Van Every & Kritsky, 1992; A. maranhensis n. sp. and Notozothecium sp. Anacanthorus sp. 1 differs from its congeners by the morphology of the MCO, which is a flat tube with sclerotized walls and pointed terminations at both ends. Anacanthorus maranhensis n. sp. differs from its congeners by the morphology of the MCO, which is a trough-shaped tube. This study increases the number of reported dactylogyrids from P. nattereri to 28, and to 26 for S. rhombeus.
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