Assertion: vertebrate | /r/RelatedTo | cephalochordate
Facets:
value: within the chordates
type: LOCATION
value: most closely
type: DEGREE
Source sentences:
text: Some researchers believe that, within the chordates, craniates are most closely related to cephalochordates, but there are also reasons for regarding tunicates (urochordates) as craniates' closest relatives.