The seamount biota has gained considerable conservation momentum in the latter years. Nonetheless, very little is known about seamount sponges across the world, and off Brazil in particular. The present study describes three new species of Erylus Gray, 1867 (Demospongiae, Astrophorida, Geodiidae) from bathyal waters in the Almirante Saldanha seamount (Rio de Janeiro State, Brazil). The material described here stemmed from dredging conducted during Programme REVIZEE in 1997 and 2002. Several new species of Erylus have been described recently from the Brazilian coast, and it appears that more will eventually show up. An updated identification key to southwestern Atlantic Erylus is given, as well as a tabular synopsis of micrometric and distribution data for the Erylus of the world. Finally, a checklist of published records of sponges from the Almirante Saldanha seamount is offered, and contrasted to the MNRJ sponge collections for this, as well as additional Brazilian seamounts.