Assertion: cellular sponge | /r/HasProperty | the calcarea
Facets:
Source sentences:
text: As their skeletons are both made of glass rather than calcium, early classification schemes grouped hexactinellids with the demosponges; however, at present hexactinellids are separated from cellular sponges (the Calcarea and Demospongiae) in the subphylum Symplasma because of their unique (syncytial) structure.