Sponges (Lithistida)

The Coelenterata are an obsolete phylum which encompassed sponges and Cnidarians (with ctenophores within Cnidaria).  The  order Porifera is now classified as a phylum containing all filter feeding sponges.  The most basal of the eumatetazoan phyla, Porifera are derived from the sister taxon to eumetazoans, single celled choanoflagellates.  This wall chart shows representative body forms (1-4), internal structures (5-8) and spicule shapes (7 & 9) of an obsolete class now distributed throughout Porifera.  The group Lithistida has been retained as an order whose members are mainly known as fossils but still have some extant representatives.