Assertion: mayfly's eye | /r/HasProperty | ocelli
Facets:
Source sentences:
text: The top of the head bears three simple eyes (ocelli), which may measure light intensity, and a tiny pair of antennae that serve no olfactory function but may measure air speed.
text: In addition to their large compound eyes, wasps have several simple eyes known as ocelli, which are typically arranged in a triangle just forward of the vertex of the head.