6. Body Symmetry and Cephalization Central Axis A Radial Plane Another Radial Plane (a) Radial Symmetry Sagittal Plane Anterior Posterior (b) Bilateral Symmetry
7.
8. Body Cavities: The Acoelomates Digestive Cavity Digestive Lining Solid Tissue Body Wall No cavity between body wall & digestive tract Cnidaria
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10. Body Cavities: The Pseudocoelomates Digestive Cavity Digestive Tract Pseudocoelom Body Wall Body cavity partially lined with mesoderm Partial Lining Nematoda
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12. Body Cavities: The True Coelomates Digestive Cavity Digestive Tract Coelom Body Wall Body cavity completely lined with mesoderm Complete Lining Annelida
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14. Evolutionary Tree of Major Animal Phyla Porifera No true tissues True tissues 2 tissue layers; radial symmetry Ctenophora Cnidaria 3 tissue layers; bilateral symmetry Platyhelminthes No body cavity Body cavity Pseudocoel Nematoda Rotifera Coelom Protostome development Annelida Mollusca Insecta Deuterostome development Mammalia Echino- dermata
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16. The Body Plan of Sponges Osculum Epithelial Cell Spicules Amoeboid Cells Pore Cell Collar Cell Pore Water Flow
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18. Cnidarian Body: The Polyp Mouth Tentacle Body Wall Mesoglea Gastrovascular Lining Gastrovascular Cavity Foot Column
19. Cnidarian Body: The Medusa Mouth Tentacle Body Wall Mesoglea Gastrovascular Lining Gastrovascular Cavity
20. Cnidarian Weaponry: The Cnidocyte Armed Cnidocyte Body Wall Water Filament Trigger Nuclei Spent Cnidocyte
21.
22. Flatworm Organ Systems (a) Digestive System Gastrovascular Cavity Pharynx (b1) Excretory System Excretory Canal Excretory Pore (b2) Nervous System Nerve Cord Brain
23. Life Cycle of Human Pork Tapeworm Measly pork marketed for human consumption. Larvae migrate through vessels to pig muscles & encyst there. Larvae hatch in pig intestine Pig eats food contaminated by infected feces Adult tapeworm Human eats poorly cooked pork with live cysts. Larval tapeworm liberated by digestion & attaches to human intestine. Head with hooks & suckers Tapeworm matures in human intestine, producing a series of reproductive segments. Egg-filled segments are shed from worm & passed in human feces.
24.
25. Heartworms in the Heart of a Dog Open heart of dog Female heartworms
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27. An Annelid: the Earthworm Mouth Brain Pharynx Ventral Vessel Ventral Nerve Cord Hearts Esophagus Crop Gizzard Intestine Ventral Nerve Cord Anus Coelom Intestine Excretory Pore Nephridia Coelom
28.
29.
30.
31.
32. Insect Body Plan Wing Abdomen Thorax Head Antennae Compound Eyes Mouth Parts
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