D. antillarum is not the only urchin that occurs in the Caribbean. Please be sure you are reporting only on the Long-spined urchin, D. antillarum.
The pictures below are examples of D. antillarum. This are the only species you should report on.
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The pictures below are examples of other urchins that you may encounter in Caribbean waters. These are not species you should report on.
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E. viridis / Reef urchin | E. lucunter / Rock-boring urchin | A. punctulata / Common arbacia urchin | |
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L. williamsi / Jewel urchin | L. variegatus / Variegated urchin | M. ventricosa / Red heart urchin |