Assertion: sponge's body | /r/HasProperty | fixed on a skeleton of porous walls
Facets:
Source sentences:
text: The extinct Archaeocyatha, with a cup-shaped body fixed on a surface and a skeleton of porous walls, were aberrant forms that lived exclusively in the Cambrian and that are generally considered as a separate phylum, even though they do show some affinities with the Calcarea.