Assertion: arthropod's eye | /r/CapableOf | miss among specie
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: A cephalothorax and much smaller abdomen make up the extremely reduced body of the pycnogonid, which has up to two pairs of dorsally located simple eyes on its non-calcareous exoskeleton, though sometimes the eyes can be missing, especially among species living in the deep oceans.