Slate pencil sea urchins (Heterocentrotus mammillatus) color the foreground of this Hawaiian reef scene. A diver, Pennantfish (Heniochus diphreutes), and Pyramid butterflyfish (Hemitaurichthys polylepis) dominate this reef scene with a diver; Hawaii, United States of AmericaImage #: 33443432 See More From: Dave Fleetham