The sea urchin is a prickly-looking marine animal that is spherical in shape and covered with long movable spines.
The echinoderm is a member of a large group (phylum) of spiny-skinned marine animals, including starfish, sea urchins, and sea cucumbers. See more »
The sea cucumber is a marine animal shaped like a cucumber or sausage, related to the starfish and the sea urchin. See more »
The sea urchin is a prickly-looking marine animal that is spherical in shape and covered with long movable spines. See more »
The starfish, or sea star, is a bottom-dwelling marine animal. Despite its name, the starfish is not a fish; it is an echinoderm, a type of marine animal that is spiny-skinned. See more »
The brittle star is a marine animal related to the starfish, sea cucumber, sea urchin, and sand dollar. See more »
Crinoid is a word for any member of a class of colorful, plantlike sea animals related to the starfish. See more »
The sand dollar is a small disc-shaped marine animal closely related to the sea urchin. See more »