Sea Urchin Species

A catalog of all the species of sea urchins I've encountered in the wild.

California Coast

Red Sea Urchin

Mesocentrotus franciscanus

Pacific Purple Sea Urchin

Strongylocentrotus purpuratus

Hawaiian Islands

Helmet Urchin

hāʻukeʻuke kaupali

Colobocentrotus atratus

Blue-lined Long-spine Urchin

Diadema savignyi

Rock-boring Sea Urchin

ʻina kea, ʻinaʻula

Echinometra mathaei

Oblong Sea Urchin

ʻina ʻeleʻele

Echinometra oblonga

Needle-spined Urchin

Echinostrephus aciculatus

Banded Sea Urchin

Echinothrix calamaris

Blue-black Urchin

Echinothrix diadema

Red Slate Pencil Urchin

hāʻukeʻuke ʻulaʻula

Heterocentrotus mamillatus

Collector Urchin

hāwa‘e maoli

Tripneustes gratilla

New England Coast

Purple Sea Urchin

Arbacia punctulata

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