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	Kingdom Animale | Phylum Echinodermata

Phylum Echinodermata Adults of these "spiny-skinned animals" are usually radially symmetrical. They have a water vascular system, which is a complex of tubes and canals filled with watery fluid. Movement is effected through this hydraulic system and the liquid-filled tube feet. Echinoderms on the site Class Asteroides Sea Stars Family Astropectinidae Sand Star Astropecten Family Archasteridae Sea Star Archaster Class Holothuroidea Sea Cucumbers Class Echinoidea Sea Urchins Family Temnopleuridae Banded Urchin Salmacis Family Centrechinidae Black Sea Urchin Diadema setosum Family Spatangidae Heart Urchin Maretia Class Ophiuroides Serpent Star or Brittlestar Family Ophiotrichidae

Introduction Shore environment

From A Guide to Seashore Life by Dr Leo W H Tan and Peter K L Ng Published by the Singapore Science Centre and sponsored by BP @Raffles Museum of Biodiversity Research and Singapore Science Centre