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Phylum Arthropoda

Phylum Arthropoda. Julie, N eema , P rachi Patel & Shiwani D esai. Definition: A phylum containing arthropods, an invertebrate animal having an exoskeleton, segmented body, and jointed appendages. 3 Classes. Insecta. Ants. Butterflies. Flies. Bees. Crustaceans. Crabs. Shrimp.

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Phylum Arthropoda

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  1. Phylum Arthropoda Julie, Neema, PrachiPatel &ShiwaniDesai

  2. Definition: A phylum containing arthropods, an invertebrate animal having an exoskeleton, segmented body, and jointed appendages.

  3. 3 Classes

  4. Insecta Ants Butterflies Flies Bees

  5. Crustaceans Crabs Shrimp Lobsters

  6. Arachnids Spiders Scorpions Mites

  7. 3 Germ Layers

  8. Ectoderm  Outermost layer of germ cells  Develops into skin and nervous tissue

  9. Mesoderm  Middle layer of germ cells  Connective tissue, bones, muscles, and the circulatory system develop

  10. Endoderm  Innermost layer of germ cells  Lining of the digestive and respiratory system

  11. Symmetry • Bilateral  the left and right sides of the arthropod body are mirror images of one another

  12. Coelom • A cavity lined by an epithelium derived from the mesodermlayer. • Organisms that form inside the coelom freely move, grow, and develop independently of the body wall. • In arthropods it is reduced; consists only of a small cavity surrounding the reproductive excretory organs.

  13. Cephalization • Cephalization- the concentration of sensory tissues in the anterior part of the body (head). • Arthropods typically have highly sophisticated heads possessing numerous appendages, sensory organs, their brain, and their mouth

  14. Digestive Tract • The digestive tube is complete, containing a mouth and anus. • The digestive tract varies greatly in structure, depending upon the diet and feeding mode of the animal. One example of a digestive tract with a mouth, and anus.

  15. Grasshopper Digestive Tract Diagram

  16. Segmentation • The embryos of all arthropods are segmented • Built from a series of repeated modules

  17. Skeleton • Has an exoskeleton made from chitin • Serves as protection and provides places for muscle attachment • Skeleton doesn’t grow with them Pillbug shedding exoskeleton

  18. Appendages • Jointed appendages  antennae, mouth parts, legs • Function as limbs • Some vanish or are highly modified

  19. Circulatory System • Open circulatory system • blood is pumped forward by theheart, but then flows through the body cavity, directly bathing the internal organs • Dorsal heart • belonging to, on, or near the back orupper surface of an animalor organ Dorsal view of the heart.

  20. Respiratory System • Aquatic arthropods (crustaceans) possessgills for respiration • Gills are outgrowths of the skin • Terrestrial arthropods possesstrachea andbook lungs as respiratory organs • Book lungs- chambers with leaf-like plates for exchanging gases

  21. Respiratory System of a grasshopper

  22. Reproduction • Some arthropods lay eggs and are noted for prolonged maternal care • Some arthropods have organs of both sexes • Due to presence of exoskeleton the growth of an arthropod is periodical

  23. Habitat • Worldwide • Deep sea • Coastal waters • Rivers and Streams • Land • Grasslands

  24. FUN FACTS!! About 84 percent of species known are arthropods No two human beings have the same fingerprint; likewise, no two spider webs are the same. A typical bed usually houses over 6 billion arthropods (dust mites)  Ants don't sleep Each year, insects eat 1/3 of the earth's food crop. Mosquitoes prefer children to adults, blondes to brunettes and their favorite color is blue

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