Assertion: spider's cribellum | /r/CapableOf | separate into left
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: The cribellum (usually separated into a left and a right half) produces a thread made up of hundreds to thousands of very fine dry silk fibers (about 10 nm thick) around a few thicker core fibers, which then are combed into a woolly structure by using a group of specialized hairs (setae) on their fourth pair of legs.