Alternative Phylogenies

1
Level of organization
Whats the advantage?
2
Symmetry
0, spherical, radial, bilat. 0 radial bilatera
l 2nd penta-radial bilateral
3
Germ Layers
0 1 not really a germ layer 2 3
4
Coelom
No No No No Pseudo Yes, schizocoely

enterocoely
5
Metamerism
No No No No No No Yes Yes No Yes
6
Digestive system
intracellular intracellular (but, specialized
cells) gastric cavity blind gut flow through
gut