water vascular system
Echinoderms are a phylum with usually 5 fold symmetry, spines and calcium carbonate plates.
exoskeleton
Yes, they have no notochords or spines.
Echinoderms have tube feet, with the exception of urchins, which have spines. They are invertebrates. They also have no organs or eyes.
No -- starfish or seastars are echinoderms and as such are invertebrates. -- no spines.
Echinoderms are invertebrates that have internal skeletons and spines sticking out from their bodies.
The name echinoderm means "spiny skin." Echinoderms have spines of various lengths that cover the outside of their bodies. Most echinoderms are supported and protected by an internal skeleton made up of bonelike plates. Echinoderms have a simple nervous system but don't have heads or brains.
Invertebrate animals with spikes and spines all over their bodies.
Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a round, symmetrical, calcareous shell covered with long spines
They have radial symmetryThey have internal calcareous skeletonThey are often covered with spines (sea urchins, etc)
Aye, Echinoderms means spiny-skinned. Just imagine some echinoderms like starfish (class asteroidea) and the sea urchin (class echinoidea). The crown of thorn starfish has poisonous spines and the sea urchin is covered 360 degrees in spins. However it is important to note that not all echinoderms are spiny. For example there are no spines whatsoever on the sea cucumber (class holothuroidea) which has a soft and gelatinous body.
Gills and a well developed nervous system