Assertion: gastropod's shell | /r/HasProperty | absent
Facets:
value: in the cephalopods
type: LOCATION
value: completely
type: DEGREE
value: sometimes
type: TEMPORAL
Source sentences:
text: A diverse group; adult body snail like or sluglike, usually with some coiling, may have a delicate external shell, but shell is sometimes internal or absent; radula usually present; external gill sometimes present; body may be narrow or broad, often wedge shaped with a broad, solelike foot on the underside; edge of foot may be drawn out on either side to form a flap or winglike outgrowths known as parapodia; front of body usually bears 2 tentaclelike sensory structures, but head structures often appear reduced; some shelled forms have an operculum
text: Slug, any mollusk of the class Gastropoda in which the shell is reduced to an internal plate or a series of granules or is completely absent.
text: Shells, which are so typical of mollusks, appear to be absent in the cephalopods.