Two individuals of the long-spined West Indian sea urchin, Diadema antillarum, attacked other sea urchins after food deprivation. Spines, pedicellariae, and tests were devoured. Only certain species of sea urchins were attacked. Whether “taste preference” was involved
here or whether Diadema physically could not or preferred not to devour other species of urchins is not known. It is believed that Diadema does not prey on other urchins under natural conditions unless food is scarce. A case in which a Pacific diadematid, Astropyga pulvinata,
fed on another urchin is also cited.
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