Kingdom Animalia - Eucoelomates Phylum Echinodermata We recognize five classes within Phylum Echinodermata for the purpose of this course. All organisms within this phylum possess a unique water vascular system composed of coelomic canals.   Class Asteroidea Images Sea Star Starfish Dissection Class Ophiuroidea Images Brittle Star Sea Basket Sea Basket2 Class Echinoidea Images Echinoidea Samples Sand Dollar Urchin Display Class Crinoidea Images Crinoidea  Image Class Holothuroidea Images Sea Cucumber Sea Cucumber Evisceration back to Eucoelomates back to Kingdom Animalia back to Laboratory Review main page