Tortoise-
a. It is usually larger in size.
b. Oval carapace is present.
c. Head can be completely withdrawn into the shell.
d. Habitat - Semiterrestrial and fresh water
e. Forelimbs and hindlimbs are not modified into paddles.

Turtle-
a. It is comparatively smaller in size.
b. Heart-shaped carapace is present.
c. Head can be partially withdrawn into the shell. d. Habitat - marine
e. Forelimbs and hindlimbs are modified into paddles.