Atlantic Purple Sea Urchin
Arbacia punctulata · Also known as: purple urchin, punctuate urchin
Spiny purple urchin of Mid-Atlantic hard bottoms and jetties. Occasional beach find and a relative of sand dollars.
Quick facts
| Group | Echinoderm |
|---|---|
| Likelihood nearby | ★★★☆☆ |
| Habitats | Inlet, Offshore / ocean, Ocean beach, Coastal bays |
| Seasons (this coast) | year-round |
How to recognize them
- Round body covered in medium-length purple to brown spines.
- Empty tests show neat rows of bumps where spines attached.
Biology notes
- Grazes algae and scavenges on rock and shell bottoms.
- Tube feet help it climb and hold on in surge.
Where to see them around Ocean City
- Ocean City Inlet rocks and other hard structure.
- Occasional wash-ups on ocean beaches after rough seas.
When to look
- Year-round on structure; storm windows for beach finds.
Viewing tips & etiquette
- Spines can puncture skin—look, don’t squeeze. Leave live urchins where they are.
