Echinoderm marine animals belong to the Phylum Echinodermata.
The group includes sand dollars, sea stars, sea urchins, and sea cucumbers.
When Echinoderms reach their adult stage, they usually feature their unmistakable five-point radial symmetry.
The groups contain more than seventy thousand living species.
It is a super phylum found in all depths of the earth's oceans, and the phylum is the largest without freshwater or land-based representation.
Echinoderm Invertebrates |> Sea Stars |> Sea Cucumbers |> Sea Urchins |> Sand Dollars |