Phyla Members

Sea stars:

http://echinoblog.blogspot.ca/2013/04/how-many-starfish-species-are-there.html

 

Sea Urchins:

http://conservationmagazine.org/2008/07/overfishing-implicated-in-sea-urchin-epidemics/

 

Sea Cucumbers:

http://normalaquatics.com/the-beauty-of-the-sea-cucumber/