Molluscs and Crustaceans

[SuperPigeon]

What is the difference between Molluscs and crustaceans. Is it that crustaceans have shells and molluscs dont because I thought barnacles were molluscs but they have shells.

Other information on classification would also be handy thanks

[RATTER15]

So is my tortoise a crustacean

[gen2]

Just to clear up RATTER15's misconception first. A tortoise has an internal skeleton and is a vertebrate. It is a reptile.

Molluscs have an unsegmented body and a mantle that often secretes a shell. eg snail, slug, oyster, squid

Crustaceans have segmented bodies, an exoskeleton, and jointed limbs. Crustaceans have to shes their exoskeleton in order to grow. eg woodlouse, crab, krill, barnacle

[gen2]

* * * shed, not shes in the above * * *

[SuperPigeon]

thnaks