Brittlestar
Ophiuroidea
Five wriggly arms row across the seafloor.
A brittlestar looks like a tiny center disk wearing five long snaky arms. It rows those flexible arms to scoot, climb, gather food, or escape danger.
Find this SeaPal in the card gallery
From field guide to game table
Bring this Brittlestar home
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Quick dive
Creature passport
- Home
- Brittlestars live on seafloors worldwide, including deep mud, coral, sponges, and rocks.
- Favorite foods
- Different species catch drifting particles, scavenge scraps, or hunt tiny animals.
- Size check
- Often a coin-sized disk with arms five to eight times longer
Tell-your-friends facts
Four wonderfully wild things
- 1
Brittlestars are echinoderm cousins of sea stars, urchins, and sea cucumbers.
- 2
About 2,000 living species are known.
- 3
Their arms bend at many little joints like a chain of vertebrae.
- 4
They move mainly by rowing their arms rather than walking on tube feet.
Ocean superpower
Built to be amazing
It can drop a trapped arm and grow a replacement later.
Junior scientist tip
What should I look for?
Find a sharp-edged center disk with five clearly separate, snake-like arms.
Grown-up research links
We used trusted science organizations to check this profile.