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Arthropods!

Arthropods!. Do Now: Turn in Earthworm dissection. Phylum Arthropoda. Biggest phylum of animals currently alive and extinct. Several MILLION different species Exist in every environment, in almost every ecosystem on Earth.

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Arthropods!

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  1. Arthropods! Do Now: Turn in Earthworm dissection

  2. Phylum Arthropoda • Biggest phylum of animals currently alive and extinct. • Several MILLION different species • Exist in every environment, in almost every ecosystem on Earth. • By any measure, the most “successful” animal phylum. ¾ of all known species of animal are arthropods.

  3. What Makes an Arthropod? • Exoskeleton: • Hard, protective outer “shell.” • Used for movement • Made with chitin, a polysaccharide.

  4. Exoskeleton for Muscle Attachment • Your muscles are attached to an endoskeleton. • An exoskeleton serves the same purpose

  5. What Else Makes an Arthropod? • Bilateral symmetry

  6. Segmented body plan • Each segment has at least 1 pair of appendages. • Legs, antenae, flipers, claws, etc. are all appendages. • Some segments may be fused together.

  7. 3 Main Body Sections • Called tagmata: Some may be fused

  8. Jointed Appendages (and lots of ‘em)

  9. Recap: Arthropod Characteristics • EXOSKELETON • Bilateral symmetry • Segmented body plan (3 main sections: head, thorax, abdomen) • Jointed appendages (many pairs). Note: arthropod means “jointed foot.”

  10. Arthropod Circulatory System • Open circulatory system with heart.

  11. Arthropod Respiration • Gills/book lungs: oxygen diffuses into blood • Trachea: air moves into insect directly

  12. Types of Arthropods • Domain: Eukyra • Kingdom: Animalia • Phylum: Arthropoda • Classes: Crustacea, Insecta, Arachnida (+ Myriapoda

  13. The Family Tree

  14. Class Crustacea: The Crustaceans • Only arthropod class with 2 pairs of antennae.

  15. Class Crustacea: The Crustaceans • Includes crabs, lobsters, shrimp, as well as pillbugs.

  16. Crustacean Orders • “True” Crustaceans = Order Decapoda • 5 pairs of thorasic legs • 2 tagmata • Cephalothorax • Abdomen • “Pillbugs” = Order Isopoda • 7 pairs of thorasic legs • 3 tagmata

  17. Class Insecta • 1 pair of antennae • 3 pairs of legs • 3 tagmata • Wings or wingless

  18. Insect Diversity • Biggest order of animal on Earth • Over 900,000 documented species. • Highest estimates suggest up to 30,000,000 species may exist.

  19. Class Arachnida: Spiders, Ticks, Scorpions, Mites, etc. • No antennae • 4 pairs of legs

  20. Arachnids Trilobites = Extinct Arachnids

  21. Centipedes And Millipedes: Class Myriapoda • One pair of antennae. • Two tagmata: head and trunk 1 pair of legs per segment centipede subclass chilopoda 2 pairs of legs per segment Millipede subclass diplopoda

  22. Recap: Arthropod Family Tree Phylum Arthropoda Class Crustacea Class Insecta Class Arachnida Class Myriapoda many orders many orders, including extinct trilobites Chilopoda Deca-poda diplopoda Iso-poda

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