Echinoderms: 8 Beautiful Types of Echinoderms You Probably Don’t Know


Echinoderms! Echinoderms are invertebrate animals that have pentaradial symmetry, a spiny skin, a water vascular system, and a simple nervous system. Echinoderms The echinoderms are a group of animals that includes starfish, urchins, feather stars, and sea cucumbers. They are simple animals, lacking a brain and complex sensing organs. They have pentaradial symmetry and a calcareous endoskeleton that may possess pigment … Read more