Brasergasilus mamorensis sp. n. (Copepoda: Ergasilidae) from the Nasal cavities of Hydrolycus pectoralis (Guenther, 1866) (Characiformes: Cynodontidae) from the Brazilian Amazon, and considerations about Abergasilinae

Brasergasilus mamorensis sp. n. (Copepoda: Ergasilidae) from the Nasal cavities of Hydrolycus pectoralis (Guenther, 1866) (Characiformes: Cynodontidae) from the Brazilian Amazon, and considerations about Abergasilinae

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Brasergasilus mamorensis sp.n., collected from the nasal cavities of Hydrolycus pectoralis (Guenther, 1866) in the Mamoré River, Rondônia State, Brazil, is described.

This is the first time that a species from the here genus Brasergasilus has been collected in the nasal cavities.This new species is the only one that has a spine on the first segment of the antenna, a simple seta on the basipodites of the first three pairs of legs and one pair of vestigial legs (leg 5 ) product on the sixth thoracic somite.