Still other species' shells are coiled helically, superficially like that of a large gastropod (as in ' and ').

Pleurotomarioidea is a superfamily of small to large marine gastropods included in the Vetigastropoda.

This species is the largest gastropod in the American waters, and one of the largest univalves in the world.

The center's mascot is the banana slug, a large yellow gastropod.

Older and larger gastropods are more likely to show infection.

Ficidae, common name the fig shells are a family of medium to large marine gastropods.

This large gastropod is preserved in an oolitic limestone.

Pleurotomariidae, common name the "slit snails", is a family of large marine gastropods in the clade Vetigastropoda.

As she moves off into the forest, the Wraith assumes its natural form, a large gastropod.

The Shalra were essentially large gastropods with long, ridged shells.