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Invertebrate Animals

Invertebrate Animals. (MOST Animals -- >95%!). Animal Phylogeny. Porifera Cnidaria Platyhelminthes Nematoda Annelida Mollusca Arthropoda Echinodermata. Invertebrates. Porifera (Sponges). Simple, ALMOST Colonial No Symmetry No Gut 2 Tissue Layers Acoelomate (“Spongocoel”)

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Invertebrate Animals

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  1. Invertebrate Animals (MOST Animals -- >95%!)

  2. Animal Phylogeny Porifera Cnidaria Platyhelminthes Nematoda Annelida Mollusca Arthropoda Echinodermata Invertebrates

  3. Porifera (Sponges) • Simple, ALMOST Colonial • No Symmetry • No Gut • 2 Tissue Layers • Acoelomate (“Spongocoel”) • Sessile filter feeders

  4. Porifera (Sponges)

  5. Cnidaria (Jellyfish, Anemone) • Simple • Radial Symmetry • Incomplete Gut = Gastrovascular Cavity (GVC) • 2 tissue Layers • Acoelomate

  6. Cnidaria (Jellyfish, Anemone) • Sessile (Polyp) or Mobile (Medusa) forms

  7. Cnidaria (Jellyfish, Anemone) • Carnivores • Tentacles with stinging cells • Cnidocytes

  8. Platyhelminthes (Flatworms) • Simple • Bilateral Symmetry • Incomplete Gut = Gastrovascular Cavity (GVC) • 3 tissue Layers • Acoelomate • Protostomes http://www.biology.ualberta.ca/courses.hp/zool250/Labs/Lab04/DugesiaCrawling.mov

  9. Platyhelminthes (Flatworms) • Incomplete GVC is finely branched. • Simple Nervous System • Simple Reproductive System

  10. Platyhelminthes (Flatworms) • Tapeworms

  11. Nematoda (Smooth Roundworms) • More Complex • Bilateral Symmetry • Complete Gut • 3 tissue Layers • Pseudocoelomate • Protostomes • Many soil-dwellers • Many parasites

  12. Nematoda (Smooth Roundworms) • More complex Digestive System • More complex Reproductive System • No Circulatory system

  13. Nematoda (Smooth Roundworms)

  14. Annelida (Segmented Roundworms) • More Complex • Bilateral Symmetry • Complete Gut • 3 tissue Layers • Coelomate • Protostomes • Many soil-dwellers • Many marine • Some parasites Earthworms Polychaetes Leeches

  15. Annelida (Segmented Roundworms) • Segmentation  Specialization • Basic central nervous system • Complex reproductive system • Complex digestive system • Open circulatory system • Simple kidney system

  16. Annelida (Segmented Roundworms)

  17. Mollusca (Snails, Clams, Squid) • Even More Complex! • Bilateral Symmetry (some modified) • Complete Gut • 3 tissue Layers • Coelomate • Protostomes • Diverse!

  18. Mollusca (Snails, Clams, Squid) • Soft bodies, often with a CaCO4 shell • Complex systems (digestion, reproductive) • Open circulatory system • Simple respiratory system (gills) • Modified Segmentation  Specialization • Foot (musclular, locomotion) • Visceral Mass (organs, organ systems) • Mantle (membranous covering & shell secretion)

  19. Mollusca (Snails, Clams, Squid) • CLASS Gastropoda (Snails, Slugs)

  20. Mollusca (Snails, Clams, Squid) • CLASS Bivalvia (Clams, oysters, scallops)

  21. Mollusca (Snails, Clams, Squid) • CLASS Cephalopoda (Octopus, Squid)

  22. Arthropoda (Insects, Crustaceans, Spiders) • Rather Complex! • Bilateral Symmetry • Complete Gut • 3 tissue Layers • Coelomate • Protostomes • Very Diverse!

  23. Arthropoda (Insects, Crustaceans, Spiders) • Hardened Exoskeleton (Protein & Chitin) • Molting to grow • “Jointed Feet” • Segmentation (often modified through fusion) • Specialization • Open circulatory system • Simple respiratory system (gills, book lungs, tracheal system) • Complex systems (digestion, reproductive)

  24. Arthropoda • CLASS Insecta (grasshopper, fly, butterfly, ladybug, mantis, bee, wasp, etc.) 3 sets of walking appendages Metamorphosis 15 Orders!

  25. Arthropoda • CLASS Arachnida (Spiders, Ticks, Scorpions) Chelicerae (jaws) 4 sets of walking appendages

  26. Arthropoda • CLASS Crustacea (Crabs, Shrimp, Lobsters)

  27. Echinodermata(Sea Stars, Starfish, Sea Urchins) • Somewhat Complex • Radial Symmetry • Complete Gut • 3 tissue Layers • Coelomate • Deuterostomes

  28. Echinodermata(Starfish, Sea Urchins) • Radial Symmetry is “secondary” • Almost Radial • Larvae are bilateral • Endoskeleton (hardened calcium plates or spines) • “Spiny-skin” • Water Vascular System • Hydraulic locomotion,feeding, gas exchange • Complete Gut • (Seems Incomplete)

  29. Echinodermata (Starfish, Sea Urchins)

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