Location: Maui, Hawaii
Florent's Guide To The
Tropical Reefs
Blue-Black Urchin
Echinothrix diadema
Scientific Name: Echinothrix diadema
Category: Sea Urchins
Size: 4 to 8 in. (10 to 20 cm)
Depth: 3-30 ft. (1-10 m)
Distribution: Indo-Pacific, Hawaii
All Photographs
© 2026 Florent Charpin