Animal Kingdom Invertebrates Tour of the Invertebrate Organisms of the Animal Kingdom

Invertebrates Are Animals Animal Characteristics –Eukaryotic –Heterotrophic –Multicellular, specialized cells –Lack Cell Walls –Reproduce, sexual and asexual –Respond to environment –Motile, muscles

Specifics to Invertebrates Characterized by No Backbone! Other means of structure Exoskeleton, Spicules, Shells, Pin, Hydrostatics Invertebrate Fun Facts 95% of all animal species Sizes range from microscopic to 20 meters

Classifying Invertebrates Body Symmetry Cephalization Level Body Plan Layers of Tissue Early Development – Protostome or Deuterostome

Major Groups Crustacea Platyhelminthes Annelida Porifera Cnidaria Insecta Mollusca Nematoda Echinodermata

Things to Consider Level of Classification –Phylum or Class Common name examples for each –sea star Type of Symmetry –bilateral Type of Body Plan –acoelomate, coelomate Development of systems –Circulatory Movement

Invert Tour Title-Invert Tour- Animals without a backbone. They share the LACK of a trait. Purpose- Observe and gather information to compare/contrast Invert groups. Observations and Notes- Class or Phylum name Examples- Common names Type of symmetry Type of Body plan systemsMajor characteristicsRank

Conclusion-Reference chapters Dragonfly 1.Which invert groups do you believe are the LEAST complex? WHY? 2.Which invert groups do you believe are the MOST complex? WHY? 3. List your evolutionary ranking from LEAST to MOST complex How does YOUR RANKING compare to the BOOK model? (pgs ) Explain in detail your ranking differences and similarities.

Class or Phylum name Examples- Common names Type of symmetry Type of Body plan systemsR an k Class Crustacea Shrimp, crabs, lobsters, barnacles bilateralcoelomateOpen circ.- heart, brain Struct for resp- gills or book gills, 5 Phylum Platyhelminthes Flukes tapeworms bilateralacoelomateDiffusion- resp, excre, circ, single opening for digestion, cephalization 3 Phylum Annelida Earthworms leeches bilateralcoelomateClosed circ system, nephridia-waste, brain, primitive heart 5 Phylum Porifera Tube Sponge Dead Man’s Fingers asymmetryacoelomateSessile, no tissues or organ systems H 2 O movement allows – circ. resp, excretion, feeding 1 Phylum Cnidaria Jellyfish corals, hydra radialacoelomateStinging cells in tentacles, gastrovascular cavity, diff. for resp, circ, excre -nerve net 2 Class Insecta Bees, butterflies, beetles, ants bilateralcoelomateOpen circ- heart, struct for resp- tracheal tubes, brain 5 Phylum Mollusca Snails, octopi, squid, clams bilateralcoelomateSoft-body- internal or external shell, aquatic-gills, snails/clams- open circ. Squid/oct closed circ, small ganglia to brains 5 Phylum Nematoda C. Elegans Ascaris bilateralpseudocoelmat e Digestive sys- two openings Diffusion- resp, excre, circ 4 Phylum Echinodermata Sea stars, sea urchins, sand dollars radialcoelomateEndoskeleton, water-vas, sys- resp, circ, movement tube feet nerve ring/ nerves 6