Sea urchin

Wikispecies has an entry on:

Echinoidea

Sea urchins

• 

  Paracentrotus lividus

• 

  Echinus Melo the water melon urchin from Alghero Sardinia

• 
• 
• 

  Skeleton

• 

  Skeleton

• 
• 
• 
• 
• 

  Sea urchin eggs

• 

  Sea urchin eggs

• 

  Fossil Lovenia woodsi

• 

  Pluteus

• 
• 
• 

  note the tentacles (Galicia, Spain)

• 

  Sea urchin in croatia

• 
• 
• 
• 

  From "On the Genesis of Species"

• 

  Pedicellariae enlarged.

• 

  Purple sea urchin

• 

  Sea urchin roe from Alghero Sardinia

• 

  Sear Urching fishing net in Alghero Sardinia

• 

  Sea urchin tracks and skeleton - intertidal zone - Khlong Yai district, Trat province, Thailand