Assertion: spiny dogfish's fin | /r/HasAspect | enlarged upper lobe
Facets:
value: as in most sharks
type: OTHER
Source sentences:
text: The caudal fin has an enlarged upper lobe, as in most sharks, very effective at propelling the shark through the water rapidly.
text: Their caudal fin has an enlarged upper lobe, which is highly efficient in propelling the shark rapidly through the water