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This study of the diversity of sea urchins of the Class: Sub-Class Echinodermata, was carried out in three ecosystems on the coast of the Kusapín District in the Ngäbe Buglé Comarca, Bocas del Toro from February to May 2022, registering a total of 223 individuals, belonging to 5 orders, 5 families, 6 genera and 9 species. The richest families were Toxopneustidae with 3 species for 33.3% of the total, where its most abundant species was Tripneustes ventricosus, with 26 individuals for 11.66%, and the Echinometridae family with 2 species for 22.2% of the total population, where Echinometra lucunter reported 38 individuals for 17.04% of the total and Echinometra viridis reported 30 individuals for 13.45% of the total. The alpha diversity of the sea urchins according to the Shannon Wiener index was (H´) = 0.339 in the rocky littoral; (H´) = 1.889 for seagrasses and (H´) = 1.507 for coral reefs. The dominance index showed that in the rocky coast d= 0.756; in seagrasses d= 0.166 and in coral reefs d= 0.238 due to the abundance of Diadema antillarum and Eucidaris tribuloides. The equity index registered similarity between the ecosystems of seagrasses and coral reefs and D. antillarum is the most extracted species in the Municipality as food.
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