Petrosiidae Van Soest (Demospongiae, Haplosclerida) contains four valid genera and two subgenera. Species are widely distributed inshallow and deeper warm-temperate to cold waters. Genera share a reticulated tangential ectosomallayer of spicules, or surface crust andare differentiated by their choanosomal skeletal structure, varying from isotropic-confused to isotropic-lamellate, and their types and sizeclasses of spicules.
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