Echinoidea. Harrison Cassidy, Lauren Bower, Ren ée Carew, Tosin Fashoranti. Introduction. Phylum Echinodermata Regular and Irregular Found in all intertidal zones ~1000 known species. Evolutionary History. Regular echinoids 450 million years ago during the Ordovician Period
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Harrison Cassidy, Lauren Bower, Renée Carew, TosinFashoranti
Heart Urchin. Digital image. Heart Urchin. N.p., n.d. Web. 24 Mar. 2014. <http://www.afsc.noaa.gov/race/media/photo_gallery/invert_files/Heart_urchin.htm>.