Bio1B Invertebrates

Porifera “Pore Bearers”

• Parazoan

• Asymmetrical Symmetry

• Aquatic

• Adults Sessile, Larvae Motile

• Filter Feeders

• Sponges

Ctenophora “Comb Bearers”

• Eumatozoa

• Radial Symmetry

• Locomotion via Cilia

• Diploblastic

• Complete Gut

Cnidaria “Stinging Ones”

• Eumatozoa

• Radial Symmetry

• Specialized Cells for Stinging

• Diploblastic

• GVC

• Not cephalized

Acoela “No Cavity”

• Eumatozoa

• Bilateral Symmetry

• Triploblastic, but not proto or dueterostome

• Cephalization, but no brain

• No gut, no digestion

Platyhelminthes “Flat Worms”

• Protostome

• Lophotrochozoan

• Coelomate

• Incomplete Gut

• Cephalization - Sensory Organs and Eyes

Mollusca “Soft Body”

• Protostome

• Lophotrochozoan

• Eucoelomate

• Complete Gut

• Variable Cephalization

Annelida “Small Rings”

• Protostome

• Lophotrochozoan

• Eucolomate

• Cephalized

• Segmented

Nematoda “Thread Worms”

• Ecdysozoa

• Pseudocoelomate

• Cephalized

• Parasitic

• Complete GI tract

Echinodermata “Spiny Skin”

• Bilateral Symmetry at Adolescence

• Pentaradial Symmetry at Adulthood

Arthropoda

• Ecdysozoa

• Body segmentation

• GI Tract

• Chitin exoskeleton

• Coelomate

• Cephalized