1. Warmup T-chart as many differences as you can. CentipedeSegmented Worm

2. Warmup T-chart as many differences as you can. SpiderAnt

3. March 29 TH, 2010

4. Examples of Each Invertebrate Vertebrate Porifora Sponges Cnidarians Jellyfish, Anemnone Mollusks Roundworms Heartworm Flatworms Tapeworm Arthropods Segmented Worms Earthworm Gastropods Snails, Slugs Bivalves Clams, Oysters Cephalopods Octopi, Squid Crustaceans Shrimp, Lobster, Crawfish Arachnids Tarantula, Black Widow Insects Beetles, Flies Echinoderms Starfish, Sea Urchins Centipedes & Millipedes

5. Arthropods Main Ideas Exoskeleton ProsCons Great protectionHigh weight limits size of organism, or must be aquatic SupportNeeds to be shed to grow, “Molting” Moisture loss minimalRequires a larval stage and metamorphosis during fast-growing youth period Sunburn not an issueMust be segmented to allow movement Chitin material doesn’t break down like skin Poor sense of touch makes antennae necessary

6. Arthropod Main Ideas Group comparison CharacteristicCrustaceansArachnidsCentipedesInsects Body Sections2 or 3223 Pairs of legs5+4Many3 Pairs of antennae 2None11 How would you arrange the groups on a branching diagram so that they are most similar from right to left, and why? We know from our Evolution unit that antennae and legs are homologous structures. Review that idea. Would it be smart to add the legs to the antennae and use that in the similarities comparison?

7. Arthropod Main Ideas Body sections: Head Thorax Abdomen Other parts: Antennae Wings Mandibles Flippers Flipperettes

8. Reproduction and Growth Cycles With Metamorphosis Egg Larva Pupa Adult Without Metamorphosis Egg Nymph Adult Hives are group organizations where a queen reproduces for the entire group. Since they all share at least 50% of their genetic material, it is still adaptive for workers to support the queen, because the offspring are almost as related as their own offspring would be. Specialization of labor occurs in hives, where slightly different versions of the same species are bred to do a particular task their entire life. Ex: Queen, drone, worker, warrior, nester Sketch!

9. Grasshopper Dissection Prep http://www.ent.iastate.edu/ref/anatomy/ihop/ http://www.biologyjunction.com/grasshopper_dissection.htm http://www.smithlifescience.com/GrasshopperDissection2.htm External Anatomy http://shs.westport.k12.ct.us/mjvl/biology/dissect/crayfish.htm Internal Anatomy http://www.middleschoolscience.com/crayfish.htm

10. Goals  Students will understand the scale of similarities and differences that contribute to classifications at the phylum and class levels of the hierarchy.  Students will understand the form and function of arthropods through hands-on work with two representative species.  Students will know how to use lists (defined vocabulary), data tables, graphs, and labeled diagrams to convey results and scientific information.

11. Grading  1 pt per complete dissection Anatomy list with descriptions Sufficient labelled diagrams  2 pts for questions answered thoughtfully

12. Questions Outline your responses first with your group. Then write a multi- paragraph essay for each prompt. 1)Which differences between the crawfish and grasshopper are important adaptations to their respective environments? 2)What similarities contribute to their similar classification at the phylum level but different classification at the Class level? 3)Which organism is more sophisticated? Justify your answer based on your observations.