ECHINODERMS



Echinoderms are sexual. They release as many as 2.5 million eggs at one time. They release their eggs into water. There are many types of foods they eat. For example, mollusks, oysters, and clam. They eat them by inserting its stomach into the shell and begin to eat their prey. Some echinoderms include starfish,
This is a sea star.  They are also called star fish.
This is a sea star. They are also called star fish.
s
Sea urchins have spikes, and that is their defense against predators.
Sea urchins have spikes, and that is their defense against predators.
ea urchins, sea cucumbers and sand dollars. They get oxygen from gills which are thin and oxygen can diffuse in from surrounding water. The way they defend themselves is by showing their prickly skin. They usually have five-part radial symmetry and they have no subphyla, and have a poorly defined circulatory system because they don't move that
much
. They have a water vascular system which pumps water through the madroporite and have tubed feet to attach to objects.Echindoderms are very simple, but they are not the simplest phyla.They have little calcium plates under thier scales.

This Echinoderm is a sea cucumber.
This Echinoderm is a sea cucumber.

Information based on: http://www.daviddarling.info/encyclopedia/E/echinoderm.html http://www.cyhaus.com/marine/Echinoderm.htm