No, while crabs are indeed invertebrates thy have a carapace not a skin.
A spiny skinned invertebrate is called a sand dollar. That is because they are are echinoderms (a type of invertebrate),
Butterfly, worm, jellyfish, spider, sponge, starfish, and to much more to type.
It is called an Exoskeleton.
invertebrate
An invertebrate that has a soft body and a shell is called exosceloton.
A spiny-skinned invertebrate that lives on the ocean bottom floor is called a sea urchin.
an animal without a skeleton is an invertebrate
a young invertebrate If its form differs significantly from that of the adult, it is a larva (pl larvae). E.g. caterpillar to butterfly.
vertebre;backbone;or if no backbone; invertebrate
they are put into a group called invertebrate's
A dragonfly is an invertebrate because it has an exoskeleton on the outside of its body instead of an internal skeleton with a backbone.
invertebrate - has exoskeleton