Assertion: gastropod's shell | /r/HasProperty | lost
Facets:
value: during the fossilization process
type: TEMPORAL
value: partly
type: DEGREE
value: in adults
type: TEMPORAL
Source sentences:
text: Most gastropods have a single, usually spirally coiled shell, but the shell is lost or reduced in some groups.
text: The shell is partly or entirely lost in the juveniles or adults of some groups, with total loss occurring in several groups of land slugs and sea slugs (nudibranchs).
text: In this clade, the foot of the gastropod has developed into wing-like flapping appendages (parapodia) and their shells have been lost.
text: The majority of ammonoid specimens, especially those of the Paleozoic era, are preserved only as internal molds; the outer shell (composed of aragonite) has been lost during the fossilization process.