👉 Echinoderms are a group of bivalve mollusks that have a cephalopod shell and are characterized by their soft, squamous bodies, which resemble shells. They include brachiopods (oysters), clams, and scallops, among others. Echinoderms play crucial roles in the marine ecosystem as primary producers, decomposers, and food sources for many other organisms.
echinoderms