Taxonomy of Euretidae (Porifera, Hexactinellida, Hexactinosida) of Campos Basin, southwestern Atlantic, with a description of a new species

Abstract
Fourteen species of hexactinellid sponges have been known from the southwestern Atlantic, 11 of which belong to the subclass Hexasterophora. Among these, only two belong to Hexactinosida Schrammen, 1903, namely Aphrocallistes beatrix Gray, 1858, Dactylocalyx pumiceus Stutchbury, 1841. The present study increases the number of southwestern Atlantic Hexasterophora to 13 species, adding two additional Hexactinosida, namely Chonelasma choanoides Schulze & Kirkpatrick, 1910 and Eurete atlantica sp. nov. The latter species is the first record of Eurete for the Atlantic Ocean, differing from the remaining 11 known species most conspicuously by the heavy spination of its pentactines.

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