With bodies consisting of spicules of silica or calcium carbonate are, for 10 points, what phylum of organisms more commonly known as sponges?
Calcarea and hexactinellida are groups within this phylum that have excretory structures known as oscula. These organisms, whose bodies consist of the gelatinous mesohyl, depend on cells called choanocytes to produce sperm because they do not have reproductive organs. Most of these organisms are hermaphrodites and all are sessile. With bodies consisting of spicules of silica or calcium carbonate are, for 10 points, what phylum of organisms more commonly known as sponges?
Calcarea and hexactinellida are groups within this phylum that have excretory structures known as oscula.
{Porifera} [accept {sponges} until mentioned]