A revision of the supraspecific classification of the subclass Calcaronea (Porifera, class Calcarea) Author Borojevic, Radovan Departamento de Histologia e Embriologia, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Caixa Postal 68021, 21941 - 970 Rio de Janeiro (Brazil) radovan @ iq. ufrj. br radovan@iq.ufrj.br Author Boury-Esnault, Nicole Author Vacelet, Jean Centre d’Océanologie de Marseille (CNRS-Université de la Méditerranée, UMR 6540 DIMAR), Station marine d’Endoume, F- 13007 Marseille (France) esnault @ com. univ-mrs. fr jvacelet @ com. univ-mrs. fr text Zoosystema 2000 22 2 203 263 journal article 10.5281/zenodo.5392175 1638-9387 5392175 Genus Grantessa Lendenfeld, 1885 TYPE SPECIES . — Grantessa sacca Lendenfeld, 1885 by monotypy. DIAGNOSIS. — Heteropiidae with a syconoid organization and an articulate choanoskeleton. A thin cortex is formed by triactines but lacks longitudinal large diactines. The distal part of the radial tubes is frequently decorated by tufts of radially arranged diactines, indicating a close relationship to the genus Syconessa . DESCRIPTION We include in the genus Grantessa s.s. the syconoid Heteropiidae with articulate choanoskeletons (Fig. 32). We consider that they are derived from sponges similar to Syconessa , in which the increase of radial tubes had generated the articulate choanoskeleton. Grantessa are common in warm seas, and often grow as large arborescent or bushy cormus.