Assertion: peristome | /r/HasProperty | narrow furrow
Facets:
value: as a rule
type: MANNER
value: diagnostic characters
type: OTHER
Source sentences:
text: Diagnostic characters: The peristome is a narrow furrow which begins, as a rule, close to the anterior end and runs backward along the ventral side, to the mouth, which is usually placed between the middle of the body and the posterior end.