Une nouvelle voie d'évolution chez les éponges Calcinea : description des genres Burtonulla n. g. et Levinella n. g

Abstract

A new calcareous sponge collected by N.O. Thalassa on the continental margin of the Biscay Bay is described: Levinella thalassae n. g., n. sp. Dendya prolifera Dendy, 1913, is transferred to this new genus Levinella. Dendya prolifera described by Burton (1930) in Siboga collection is redescribed as Burtonulla sibogae n. g., n. sp. The family Levinellidae is formed including the new genera Levinella and Burtonulla . This family is considered to represent a new evolutionary line in Calcinea.