Assertion: pouch's opening | /r/Synonym | spiracle
Facets:
value: on all body segments
type: OTHER
Source sentences:
text: A plastron is a type of structural adaptation occurring among some aquatic arthropods (primarily insects), a form of inorganic gill which holds a thin film of atmospheric oxygen in an area with small openings called spiracles that connect to the tracheal system.
text: A smaller opening, the spiracle, lies in the back of the first gill slit.
text: Like other insects, cockroaches breathe through a system of tubes called tracheae which are attached to openings called spiracles on all body segments.