Assertion: snail's shell | /r/HasProperty | altered into cup-shaped limpet form
Facets:
value: frequently
type: TEMPORAL
Source sentences:
text: Frequently, the shell is altered into a nonspiral cap or a cup-shaped limpet form as an adaptation to life in swift currents (the freshwater family Ancylidae) or amid pounding waves on rocks (the marine families Acmaeidae, Patellidae, Fissurellidae, and Calyptraeidae).