Assertion: arthropod's number | /r/CapableOf | occur ending with transverse furrow
Facets:
Source sentences:
text: Starting with an indistinguishable proto-cephalon and proto-pygidium (anaprotaspid) a number of changes occur ending with a transverse furrow separating the proto-cephalon and proto-pygidium (metaprotaspid) that can continue to add segments.