Distribution: Warm and temperate waters in the Western Atlantic and Caribbean; intertidal to 30 m; locally abundant in crevices of soft rock, coral rubble or oyster beds. Natural History Notes: Found among tangled tubes of Phyllochaetopterus socialis (Chaetopteridae) from Araca Beach, Sao Sebastiao district, Brazil (Nalesso et al. 1995). Characteristics: The genus is characterized by branched tentacles. The species is distinguished from congeners by dark scattered hooks on the introvert and pigment spots on the tentacles. Trunk length up to 25 mm, but usually smaller.