what does echinodermata mean
Starfish, sand dollars, and sea urchins all belong to a group (phylum) of invertebrates known as echinoderms. The word echinoderm means spiny skin, which describes most of the organisms in this phylum.tarfish, sand dollars, and sea urchins all belong to a group (phylum) of invertebrates known as echinoderms. The word echinoderm means spiny skin, which describes most of the organisms in this phylum.