Gastropods are the largest, most successful, class of mollusks; They have been able to exploit a wide variety of marine, freshwater, and land habitats. They have a head with eyes and mouth, a flattened foot for crawling, and viscera that are generally coiled and carried in a spiral shell.
DIODORA
CALLIOSTOMA
BOURGUETIA
STRUTHIOLARIA
VOLUTOSPINA
DIODORA
The low, conical shell has an oval margin. On the anterior side of the apex is a keyhole-shaped opening used by the animal as an exhalant channel.
The shell is ornamented by radiating ribs, alternately
thick and thin, crossed by growth lines. HABITAT: Diodora lives in shallow water, feeding on sponges and vegetable detritus. RANGE: L. Cretaceous- Recent. INFORMAL NAME : Keyhole limpet
CALLIOSTOMA
Shaped like a regular cone with flattened sides, the thinnish shell shallow sutures separating the whorls. The whorls are
ornamented with a number of fine, spiral cords are continued on the flat base, which has no umbilicus. HABITAT: Various species inhabit rocky shres. RANGE: E. Cretaceous- Recent. INFORMAL NAME : Top shell
BOURGUETIA
The large and moderately thick shell of Bourguetia has convex whorls separated by well-marked sutures.
Its extended spire appears slightly turreted and is a little longer than the final whorl. The Upper part of the shell is ornamented with shallow grooves, dividing the surface into narrow, flat, spiral ribbons. HABITAT: Despite a superficial similarity to Viviparus,
Bourguetia was a fully marine snail that lived among coral and sponge reefs in warm and shallow seas. RANGE: M. Triassic
_L . Jurassic . INFORMAL NAME : Sea snail.
STRUTHIOLARIA
HABITAT: Diodora lives in shallow water, feeding on sponges and vegetable detritus. RANGE: L. Cretaceous- Recent. INFORMAL NAME : Keyhole limpet
DIODORA
The low, conical shell has an oval margin. On the anterior side of the apex is a keyhole-shaped opening used by the animal as an exhalant channel.
The shell is ornamented by radiating ribs, alternately
thick and thin, crossed by growth lines. HABITAT: Diodora lives in shallow water, feeding on sponges and vegetable detritus. RANGE: L. Cretaceous- Recent. INFORMAL NAME : Keyhole limpet
