Echinoderms
if you look on echinoderms this is some stuff you might learn. Echinoderms, or members of the Phylum Echinodermata, are some of the most easily-recognized marine invertebrates, many of which are found in tide pools or in the touch tank at your local aquarium.
The Phylum Echinodermata contains 5 classes: Asteroidea (sea stars), Ophiuroidea (brittle stars and basket stars), Echinoidea (sea urchins and sand dollars), Holothuroidea (sea cucumbers) and Crinoidea (sea lilies and feather stars.) They are a diverse group of organisms, containing about 6,000 species.
taken from:
http://marinelife.about.com/od/invertebrates/p/echinoderms.htm
if you are more interested look at our other pages !!!!!
The Phylum Echinodermata contains 5 classes: Asteroidea (sea stars), Ophiuroidea (brittle stars and basket stars), Echinoidea (sea urchins and sand dollars), Holothuroidea (sea cucumbers) and Crinoidea (sea lilies and feather stars.) They are a diverse group of organisms, containing about 6,000 species.
taken from:
http://marinelife.about.com/od/invertebrates/p/echinoderms.htm
if you are more interested look at our other pages !!!!!