Stelletta ruetzleri sp. nov., a new ancorinid from the Southwestern Atlantic (Porifera: Astrophorida)*

SUMMARY: Stelletta ruetzleri sp. nov., a new ancorinid sponge from the Southwestern Atlantic (Porifera, Astrophorida), collected at 128 and 200 m depth off Rio Grande do Sul State coast, Brazil (31°20’-32°24’S/49°52’-50°15’W), is described and illustrated with SEM images of the spicules. The new species is based on the presence of one category of oxeas, dichotriaenes, oxyasters and spheroxyasters.