Assertion: gastropod's fossil | /r/HasProperty | septate
Facets:
Source sentences:
text: Although earlier molluscan fossils are also septate, Knightoconus is the latest septate mollusc before the first sipunculate cephalopods – a point that has been taken to prove its relevance to the Cephalopoda.
text: These fossils are aseptate helcionellids with a snorkel-like tube on one surface.