Tissue Layers
- Diploblast
- 2 tissue layers
- Usually radial symmetry
- Tripoblast
- 3 tissue layers
- Bilateral symmetry
Cnidarians
- Diploblast Cnidarians are carnivores.
- Aquatic, radial symmetry.
- Such as hydras (jellyfish).
- Have cnidocyte cell w/ nematocyst organelle that shoots out neurotoxins, capture prey.
- Polyp
- Sesile
- Medusa
- Motile
Are Diploblastic
- Ectoderm
- Nerve nets
- Epidermal cells contract for movement.
- Endoderm
- Gastrovascular cavity
- Not a 'complete' gut.