Assertion: crab's family | /r/HasProperty | portunidae
Facets:
Source sentences:
text: One group of specialized swimming crabs (the family Portunidae) have an oval shaped body and the last pair of walking legs are flattened and act as paddles that propel the animal.
text: The crabs of the family Portunidae, as well as some others, swim with great dexterity by means of their flattened paddle-shaped legs.
text: Swimming crab, any member of the family Portunidae (order Decapoda of the class Crustacea, phylum Arthropoda).