Dorsal nerve
Spiral cleavage
Enterocoely
Nerve surrounds gut
Schizocoely
Determinate fate
Lophophore (lost in many)
Exoskeleton
Blastopore forms anus
Blastopore forms mouth
Bilateral symmetry
Radial cleavage
Cephalization
Indeterminate fate
Trochophore larva (lost in many)
Ecdysis
Triploblastic
Ventral nerve
Coelom (of some sort)
Nerve not around gut
Molecular characters