Assertion: lamprey's jaw | /r/Synonym | gnathostome
Facets:
Source sentences:
text: Most fossil agnathans, such as galeaspids, thelodonts, and osteostracans, are more closely related to vertebrates with jaws (called gnathostomes) than to cyclostomes.
text: The group is sister to all vertebrates with jaws, known as gnathostomes.