Assertion: horseshoe crab's eye | /r/CapableOf | evolve in the bivalve mollusks
Facets:
value: once or several times
type: TEMPORAL
Source sentences:
text: Compound eyes appear to have evolved once or several times in the crustaceans and insects, in the bivalve mollusks (genus Arca), and in the annelid worms (genus Branchiomma).