Abstract
Sarangan beach at the coast of Gunung Kidul is dominated by substrates of sand, coral, and macroalgae where Echinodermata was found. This research was conducted to determine the diversity of echinoderms on that beach. Field observation was carried put during maximum low tide. Sampling was carried out by applying random sampling method. Specimens were preserved and identified. The sampled specimens consisted of a member of class Asteroidea (Anthenea sp), members of Ophiuroidea (Ophiocoma scolopendrina, Ophiomastix annulosa, and Ophiocoma erinaceus), members of Echinoidea (Colobocentrotus atratus, Heterocentrotus trigonarius, Stomopneustes variolaris, and Echinometra sp.).