| Summary: | This aimed this study were to identify the species and the density of sea urchin at Sanur and<br />Serangan beach. The research was conducted from Desember 2013 – February 2014. The<br />samples were collected from area of Sanur beach, Merta Segara beach, Mertasari beach and<br />Serangan beach, by using transect method within 5 m x 5 m. Speciesmens were identified at<br />Laboratory of Ecology and the Laboratory of Animal Taxonomy at Department of Biology,<br />Faculty of Science and Mathematics, University of Udayana. There 12 species of sea urchin were<br />found, that are Clypeaster sp., Astropyga radiata, Diadema palmeri, Diadema savignyi,<br />Diadema setosum, Echinothrix calamaris, Echinometra mathaei, Heterocentrotus sp., Maretia<br />planulata, Temnopleurus sp., Toxopneustes sp. and Tripneustes gratilla from 6 different family.<br />The highest density of sea urchin are 0,373 individual/m2 was found which were at Serangan<br />beach, and the lowest density of sea urchin are 0,144 individual/m2 was found at Mertasari<br />beach.<br />Keywords: Sea urchin species, density
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