Assertion: mollusk's shell | /r/AtLocation | freshwater snails
Facets:
value: very
type: DEGREE
Source sentences:
text: However, planispiral shells are very common in freshwater snails, where the water helps to sustain it; there is a whole family with planispiral shells, aptly named Planorbidae (from the Superorder Hygrophila, the sister-group of Eupulmonata).