Larva of a Sea Urchin
Echinocardium cordatum
 

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The larva of the common sand-burrowing heart urchin. Characteristic is the single spine at one end.

The spines will eventually become longer and more numerous. In the end a little disc will develop on the larva. When the disc grows into a little sea urchin the remains of the larva will slowly disappear.

 

Wim van Egmond

size about 0.5 mm.

 

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