are echinoderms vertebrates or invertebrates
August 4, 2010 by bknysh 2 Comments. Echinoderms are a type of invertebrate found in marine or ocean environments. Common echinoderms include the sea star, sea urchin, sand dollar and sea cucumber. Most echinoderms have arms or spines that radiate from the center of their body.nidaria are a class of invertebrates found in aquatic or marine environments. The name Cnidaria comes from the Greek word cnidos, meaning stinging nettle. There are about 9,000 species of cnidaria, the most common being the jellyfish, sea anemone, and coral.