Salani, S.; Lotufo, T. M.; Hajdu, E. Sigmaxinella Cearense sp. Nov. From Sandstone Reefs off Fortaleza (Ceara State, Brazil) (Desmacellidae, Mycalina, Poecilosclerida, Demospongiae). Zootaxa 2006, 1369, 43–53.