Assertion: fossil caecilian | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
Source sentences:
text: Fossil caecilians are very rare; until recently the oldest known caecilians were Cenozoic in age (that is, less than 65 million years old), but recent finds have pushed back the ancestry of the legless caecilians to Jurassic ancestors that had short legs.