Two new Prionospio species-Prionospio solisi sp. nov. and Prionospio nonatoi sp. nov. and a new Laubieriellus species-Laubieriellus decapitata sp. nov. are described from Espírito Santo Basin, Southeast Brazil. For both Prionospio species, branchial pattern differed from the genus diagnosis, which is therefore emended. For Laubieriellus, a new species is described, and attention is drawn to the notch in the ventral crests, a structure that holds taxonomic value.
Keywords: Annelida, Taxonomy, Polychaeta, morphology, emended diagnosis.