Practice question

Asconoid canal type represents simplest sponge architecture found in small calcareous genus Leucosolenia vase-shaped body with thin wall perforated by incurrent ostia leading directly into expansive central spongocoel lined by choanocyte layer, water expelled via single apical osculum. Pathway ostia to spongocoel to osculum short, filtering surface limited to spongocoel lining, limiting size to few millimeters due to low surface to volume ratio insufficient for metabolic demands of larger bodies. Syconoid folds wall into radial canals, leuconoid extensive branching, rhagon developmental stage transitional.