What characteristics do they have?
no arms
What unique characteristic do they have?
Aristotle's lantern
Is the ambulacral groove open or closed?
closed
Where is the madreporite located?
aboral side
Do they have pedicellariae?
yes
Do they have dermal branchiae?
yes
What do they have instead of arms?
5 rows of tube feet
Where are they found?
worldwide
What habitat are they found in?
intertidal zones
What phylum and class?
What is it called?
phylum: Echinodermata
class: Echinodea
called the sea urchins
(also has the sand dollar)
Front image: