06 October

Deuterostomates

• Second opening becomes the mouth
• Enterocoelic
• indeterminant cleavage
• radial cleavage
• lack trochophore

Echinodermata

1. dermal skeleton mesodermally produced structure

1. pieces and the piece are articulated with each other to produce a "test"
2. spines articulate with the dermal skeleton
   water-vascular system

1. tube feet

1. radial canals
2. ring canal
3. stone canal
4. madreporite

1. complete digestive tract
2. pentamerous symmetry
3. nervous system is somewhat simplified
   

1. subepidermal nerve net
   
2. simple pattern of radial nerves attached to a ring
   

1. dermal papillae