Assertion: brittle star's mouth | /r/HasProperty | stome
Facets:
Source sentences:
text: The entrance to this is known as the blastopore and it will later develop into the anus -- together with chordates, echinoderms are deuterostomes, meaning the second (deutero) invagination becomes the mouth (stome); members of all other phyla are protostomes, and their first invagination becomes the mouth.