Two new desma-less species of Theonella Gray, 1868 (Demospongiae: Astrophorida: Theonellidae), from the Great Barrier Reef, Australia, and a re-evaluation of one species assigned previously to Dercitus Gray, 1867 Author Hall, Kathryn A. Marine Environments, Natural Environments Program, Queensland Museum, South Brisbane, Queensland, Australia. Author Ekins, Merrick G. Marine Environments, Natural Environments Program, Queensland Museum, South Brisbane, Queensland, Australia. Author Hooper, John N. A. Marine Environments, Natural Environments Program, Queensland Museum, South Brisbane, Queensland, Australia. & Eskitis Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia. text Zootaxa 2014 2014-06-11 3814 4 451 477 journal article 5361 10.11646/zootaxa.3814.4.1 2d8b2273-4e20-4eab-bdce-f3f281851929 1175-5326 4919275 13BE2340-E772-421A-8215-E78578815A4E Family Theonellidae Lendenfeld, 1903 Diagnosis (after Pisera and Lévi 2002 ; Fromont and Pisera, 2011 ): polymorphic, choanosomal spicules as tetraclone desmas; ectosomal spicules as phyllo- to discotriaenes; large choanosomal oxeas sometimes present; megascleres sometimes completely absent (some Theonella ); microscleres characteristically as small, acanthose microrhabds, sometimes centrangulate or with slight curve, sometimes as streptasters and microrhabds ( Manihinea ) or streptasters only ( Racodiscula ). Type-genus: Theonella Gray, 1868 .