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 Lamontia Kirk, 1895 TYPE SPECIES . — Lamontia zona Kirk, 1895 by monotypy. DIAGNOSIS. — Baeriidae in which the choanoskeleton consists of microdiactines. Cortical and atrial skeletons have triactines and tetractines, and the cortex is pierced by large diactines. A specialized ostia-bearing zone, located below the osculum, leads the incurrent water flow to inhalant cavities. DESCRIPTION Lamontia is a particular sponge, which bears a number of similarities with Baeria . The choanoskeleton is composed of microdiactines, and there are pugioles in the skeleton of the exhalant aquiferous system. It is distinguished by a special ostiabearing zone and large diactines, which make the sponge hispid.