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Film summary
An introduction to sea stars, including one that’s a metre wide!Key facts
- Sea stars are a type of echinoderm.
- All adult echinoderms have radial symmetry, which means their body parts are arranged around a central axis.
- Sea stars feed by pushing their stomachs out through their mouths.
- With a diameter of up to 1 metre, the sunflower sea star is the largest species of sea star in the world.
Transcript
Though they look quite different from one another, all sea stars belong to the same phylum: the echinoderms.
Echinoderms
All adult echinoderms have radial symmetry.
This means that their body parts are arranged around a central axis – like the spokes of a wheel.
Radial symmetry:
Body parts radiate from centre
Most echinoderms tend …
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