Black Longspine Sea UrchinDiadema setosum
(1-2: Koh Bon, Thailand / 3: Koh Tachai, Thailand)
Double-Spined UrchinEchinothrix calamaris
(1-6: Koh Bon, Thailand / 7-8: Koh Tachai, Thailand)
Globe UrchinMespila globulus
(1-2: Richelieu Rock, Thailand)
Imperial Lance UrchinPhyllacanthus imperalis
Needle-Spined UrchinEchinostrephus aciculatus
(1: Koh Bon, Thailand / 2: Donna Ella, Fiji)
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