Although sometimes superficially similar to
sea turtles in shape, having webbed feet and thinner shells than fully terrestrial
tortoises, terrapins do not belong to the sea turtle superfamily
Chelonioidea. In
British English, the species most commonly referred to as terrapins are members of the family
Emydidae including the
red-eared slider Trachemys scripta elegans and the slider terrapin
Trachemys dorbignyi.
[2] Perhaps confusingly, although the genus to which the
box turtles belong,
Terrapene, sounds similar to the word terrapin, these turtles are not normally called terrapins.
[1]