Phylum 

 ECHINODERMATA 



Classes 

 ASTEROIDEA 



( Starfishes) 



OPHIUROIDEA 



(Brittle-stars) 



ECHINOIDLA 



( Sea-urchins) 



HOLOTHUROIDEA 



(Sea-cucumbers) 



CRINOIDEA 



(Feather-stars and Sea-lilies) 



200 



