Wikimedia Commons

Sea urchin

class of marine invertebrates
Wikispecies has an entry on:

Alive edit

Test (Skeleton) edit

  •  
      Colobocentrotus atratus
  •  
       Echinodiscus tenuissimus
  •  
    Echinus esculentus
  •  
       Paracentrotus lividus

Eggs edit

Fossil edit

  •  
      Acrosalenia hemicidaroides
  •  
      Micraster leskei

Illustration edit

  •  
    Pluteus
  •  
  •  
    From "On the Genesis of Species"
  •  
    Pedicellariae enlarged.

Video edit

  • Time-lapse video of 16-cell purple urchin embryo

Divers edit

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