13. The Embryonic Germ Layers develop from the Blastula….. Gastrula Hollow ball of cells stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron (opening) archenteron Gastrula
14.
15. 2. Body Symmetry There’s 3 basis shapes…1. asymmetry, 2. radial and 3. Bilateral symmetry
27. The body cavity of a coelomate animal (called a coelom ) is located within the mesoderm. The mesentery holds the gut in place. Digestive cavity Coelom Mesoderm
43. Phylum Porifera (Sponges) (exit for water) (digest and distribute food) (skeleton) Choanaocyte *** Sponges are Parazoans: they contain NO true tissues *** Sponges are filter feeders
63. Incomplete Metamorphosis (immature forms are often called nymphs) Nymphs resemble the adult in form except for being smaller and lacking fully developed wings and sexual organs. Life Cycle: Egg nymph adult
64. Complete metamorphosis Immature forms are called larvae (larva, singular). The pupal stage is a transition stage, when the larva is transformed to the adult. Pupa molts to the adult form. Life Cycle: Egg --> larva --> pupa --> adult