Assertion: skull's bone | /r/HasProperty | absent
Facets:
value: in living amphibians
type: OTHER
value: entirely
type: DEGREE
Source sentences:
text: Living amphibians have a relatively simplified skull in this region; a broad parasphenoid forms the floor of the braincase, the pterygoids are relatively small, and all other related bones except the sphenethmoid are absent.
text: The bone is entirely absent in living amphibians, as well as some reptilian species.
text: The bone is also absent in living amphibians.