what are echinoderms
Echinoderms (Echinodermata) are a group of marine invertebrates that includes star fish, sea lilies, feather stars, brittle stars, sea cucumbers and sea urchins.There are about 6000 species of echinoderms alive today.nimals Invertebrates. Echinoderms are divided into the following taxonomic groups: 1  Sea stars and starfishes (Asteroidea) - There are about 1500 species of sea stars and starfishes alive today.