The phylum Echinodermata has several synapomorphies, but eachsubgroup modifies these synapomorphies and thus it is difficult torelate these groups.
a) List three synapomorphies for the phylum Echinodermata.
b) For each of the synapomorphies you list, how do you expectthose features to differ between the asteroids andholothuroids?
c) For the phylum Echinodermata, which class do you think ismost similar? Why?
d) What phyla were the Echinodermata historically confused with,and why? Which do they most relate to and how is this known?
