Location: Maui, Hawaii
Florent's Guide To The
Hawaii Reefs
Red Slate Pencil Urchin
Heterocentrotus mamillatus
Scientific Name: Heterocentrotus mamillatus
Category: Sea Urchins
Size: 5 to 10 in. (12 to 25 cm)
Depth: 3-160 ft. (1-50 m)
Distribution: Indo-Pacific, Hawaii
All Photographs
© 2026 Florent Charpin