Brasergasilus guaporensis sp. n. (Copepoda, Poecilostomatoida, Ergasilidae) is proposed. The specimens were collected from the gill filaments of Leporinus fasciatus, from Guaporé River, near Pimenteiras, Rondônia, Brazil. The new species differs from the others known for the genus by the shape of the claw of the antenna and ornamentation on double genital somite and abdomen.
Copepoda; Brasergasilus; Ergasilidae; Amazon; new species