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Astropyga pulvinata observed in Coiba National Park, Panama. Picture courtesy of iNaturalist (https://www.inaturalist.org/observations/19574616).
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Centrostephanus tenuispinis at Rottnest Island, Western Australia.
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Diadema mexicanum (along with a sea star Phataria unifascialis) seen in Galapagos.
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Diadema mexicanum, aboral view showing pattern of iridophores, Tabogia, Panama, eastern Pacific. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/286).
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Lissodiadema lorioli from Moorea Biocode project (BMOO-19047 (http://biocodetest.berkeley.edu/cgi/biocode_img_query?enlarge=4444+4444+0113+2573)), French Polynesia.
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Diadema africanum observed in Madeira (off Morocco). Picture courtesy of Lesley Clements (https://www.inaturalist.org/people/lovelyclemmy).
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Sierradiadema kristini (holotype CASG 72939); image courtesy of Rich Mooi, California Academy of Science (CAS).