New sciophilous sponges from the Caribbean (Porifera: Demospongiae) Author Van, Rob W. M. text Zootaxa 2009 2107 1 40 journal article 10.5281/zenodo.187789 6593e89a-9c63-4584-9a5f-f70993e32d31 1175-5326 187789 Genus Placospherastra n. g. Definition . Placospongiidae with globose spherasters replacing the selenasters in the surface armour, with selenasters entirely lacking. Megascleres tylostyles. Additional microscleres diplasters and tiny streptasters. Type species: Placospherastra antillensis n. sp.