Spinularia Gray, 1867

Diagnosis: Small, usually more or less discoid Polymastiidae . Surface minutely hispid except at the edge where there is a strong hispidation present. Choanosomal skeleton composed of primary tracts of tylostyles between which trichodragmata are found. Ectosomal skeleton is composed of a palisade of ectosomal tylostyles. There are no true aquiferous papilla and the oscule is located at the upper part of the sponge and is slightly raised above the general surface (modified from Boury-Esnault 2002).