Assertion: mussel's shell | /r/HasProperty | oval
Facets:
value: in most surface-burrowing species
type: OTHER
Source sentences:
text: Most of them have shells that are generally rounded or oval.
text: The shell can be oval, elliptical, shaped like a wedge or like a sheath.
text: In most surface-burrowing species (the hypothetical ancestral habit) the shells are small, spherical or oval, with equal left and right valves.