SEA URCHINS
A sea urchin shell, hidden underneath the spines.
What is a test?
On this bodypart you can find eyes.
What are arms?
By breaking this down, they allow bacteria to continue decomposing.
What is organic matter?
They do this to move around.
What is crawling?
They are very sensitive to this and if in contact with it, spikes fall off of the animal.
What is algal bloom?
Another way of moving, other than with tube feet.
What is righting?
A characteristic found in 10 species, allowing them to emit light.
What is bioioluminesence?
The food they eat.
What is plankton?
This salt builds the plate, which makes up the inner mesodermal skeleton.
What is calcium-carbonate
They extend this outside their bodies in order to eat.
What is a stomach?
They are the balance and orientation organ
What are statocysts?
All sea lilies use them to exchange gas.
What are tube feet?
Sea urchins that burrow themselves into the ground
What are sand dollars?
They detach this bodypart in oder to disorient a predator
They do this when they feel endagered.
Why do they propel their own toxic organs?
Sea lilies in some places are known to be a symbol of this characteristic.
What is the symbol of fragility?
The latin word for sea urchin
What is Echinodea?
The latin word for starfish
The latin word for sea cucumber.
What is Holoturoidea?
The latin word for sea lily.
What is Crinoid?