These creatures come in three different body types known as the asconoid, syconoid, and leuconoid, all of which feature an exit system known as an osculum.  
These creatures come in three different body types known as the asconoid, syconoid, and leuconoid, all of which feature an exit system known as an osculum.  They also feature an area between the gelatinous protein matrix called the mesoglea or mesenchyme, an epidermis of flat pinocytes, and interior surfaces lined with choanocytes, or collar cells, that create currents.  Composed of four classes including Calcarea and Hex-acti-nel-lida, it is equivalent to the subkingdom Parazoa.  Most are hermaphrodites, and all adults are sessile suspension-feeding animals with radial or no symmetry.  FTP, name this invertebrate phylum whose members have a skeleton composed of spicules, which are commonly known as sponges.
These creatures come in three different body types known as the asconoid, syconoid, and leuconoid, all of which feature an exit system known as an osculum.  
Phylum Porifera (accept sponges before "Calcarea")