One class in this phylum expels their sticky cuvierian tubules through evisceration to confuse predators. Many classes in this phylum have a calcerous duct called a stone canal, which extends from an external porous calcareous plate which takes in water from outside the body. That plate is called the madreporite, which is w
One class in this phylum expels their sticky cuvierian tubules through evisceration to confuse predators. Many classes in this phylum have a calcerous duct called a stone canal, which extends from an external porous calcareous plate which takes in water from outside the body. That plate is called the madreporite, which is where sea water enters the (*) water vascular system of this phylum. An important feature of this phylum is its many small tubular projections that allow locomotion and feeding, called tube feet. This phylum begins as a bilaterally symmetric free-swimming larvae, and differs from other triptoblastic animals by undergoing metamorphosis and becoming radial symmetric. Behind Chordata, this phylum is the largest group of deteurostomes, and contains the classes Asteroidea and Holothuroidea. For 10 points, name this phylum, which contains animals such as sea cucumbers and sea stars, and whose name is Greek for "spiny skin".
One class in this phylum expels their sticky cuvierian tubules through evisceration to confuse predators.
{echinodermata}