Assertion: otter's fish | /r/Synonym | cartilaginous fishes
Facets:
value: on behalf of their skeletons
type: MANNER
Source sentences:
text: Fish in this class (which also includes fish such as rays and skates) are known as the cartilaginous fishes on behalf of their skeletons, which, rather than being made of bone, are made of a flexible material called cartilage.