Sea Urchin
Psammechinus miliaris
These small urchins graze on algae, helping to control seaweed overgrowth on rocks. They sometimes pick up shells or pebbles on their spines for extra camouflage. Around Lihou, you might glimpse them in deeper rockpools.
- Habitat: Rocky substrata or kelp holdfasts in lower intertidal and shallow subtidal zones.
- When to See: Year-round; typically in areas with good water movement.
- Length: Up to about 5 cm in diameter