the.com/echinoderm
A starfish is just a five-armed grudge with no brain and no mercy.
means A marine animal — like a starfish, sea urchin, or sea cucumber — with spiny skin and a body built on five-point radial symmetry.
from From Greek 'echinos' (hedgehog, also sea urchin) plus 'derma' (skin) — literally 'hedgehog-skinned.' The same 'echinos' root gives us 'echidna,' the spiny egg-laying mammal, so the sea urchin and the hedgehog share a very old linguistic family resemblance.
- body plan
- adults are five-fold symmetric, larvae are bilateral like you
- skeleton
- made of calcite plates, basically internal gravel
- stomach trick
- sea stars push their stomach outside to digest prey
- regrowth
- can regrow lost arms, sometimes a whole new body