Assertion: echinoderm's mouth | /r/HasProperty | exposed on loose plate sutures
Facets:
Source sentences:
text: The cladid lineage, arose by loss of the lintel circlet (3) and gave rise to three additional very successful lineages: camerates (4) with fixed brachials and fixed interradials incorporated into the calyx, symmetrical posterior plating, and rigid plate sutures; flexibles (5) with the mouth exposed on the tegmen and loose plate sutures; and the articulates (6) with loss of the anal plate and an entoneural system enclosed within the calyx plates.