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AMIMAL KINGDOM-STAR FISH AND SEA URCHINS

 

STARFISH  ,SEA URCHINS, AND  OTHER ,relatives (including  feather star,basket star,  sea daisies, sea lilies,and sea cucumbers)  make  up   the phylum   Echinoderm. A unique  feature   of  the Echinoderms   is  the  water  vascular  system,  which  consists  of  a  series  of   water   filled   canals   from  which  protrude  thousands  of  tiny  tube    feet  . The  tube feet   may  be  used  for  movement, feeding, or  respiration.Other  features  include   pentaradiate  symmetry  that  is  the  body  can  be  divided   into  five parts   radiating   from  the cent re ); no  head ; diffuse ;decentralized    nervous  system  that  lacks  a  brain ;  and  no  excretory  organs.Typically   echinoderms   also  have  an    en do skeleton(internal  skeleton  ) consisting  of a  hard    calcite    ossicles   embedded    in  the   body  wall   and  often  bearing   protruding  spines  or  tubercles .The  ossicles   may  fit  together  form  a   test (as  in  sea  urchins)  or  remain  separate  (  as  in  sea  cucumbers)
 STAR FISH  AND  SEA URCHINES



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