Sea urchin
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Wikispecies has an entry on:
Alive
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Paracentrotus lividus
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Arbacia lixula Croatia
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Diadema antillarum
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Strongylocentrotus purpuratus (Purple sea urchin)
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Echinus esculentus
Eggs
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Sea urchin eggs
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Sea urchin eggs
Illustration
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Pluteus
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From "On the Genesis of Species"
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Pedicellariae enlarged.
Video
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Time-lapse video of 16-cell purple urchin embryo