A CLUB SPINED SEA URCHIN is an ECHINODERM....and so is the GREEN SEA URCHIN (or also called the VARIEGATED SEA URCHIN)... This post is a continuation of our snorkeling Road Trip To Seashells In The Florida Keys because I had to do a little more research on these SEA URCHINS I saw this past weekend. We have all kinds of ECHINODERMS (pronounced ek-EYE- no-derms) on Sanibel which include SEA STARS, SAND DOLLARS, SEA CUCUMBERS and SEA URCHINS but these are slightly different AND I wanted to share this word with you.... I love to say it ...."Echinoderm". Ha! It was fun to see this "hairy" BRITTLE STAR (also an Echinoderm) while so many beautiful tropical fish casually swam by painting the sea with bright blues with stripes of yellows and greens. So come on in the water with me and enjoy snorkeling the underwater world in only 5 to 12 feet of water around the Florida Keys.The water's fine! …