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Phylum Arthropoda

Phylum Arthropoda. Arthropoda Overview Subphylum Chelicerata Class Merostomata Class Pycnogonida. Phylum Arthropoda. Defining Characteristics Epidermis produces a segmented, jointed and hardened chitinous exoskeleton with musculature between individual joints of appendages

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Phylum Arthropoda

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  1. Phylum Arthropoda Arthropoda Overview Subphylum Chelicerata Class Merostomata Class Pycnogonida Phylum Arthropoda

  2. Phylum Arthropoda • Defining Characteristics • Epidermis produces a segmented, jointed and hardened chitinous exoskeleton with musculature between individual joints of appendages • Complete loss of motile cilia in adult larval stages Phylum Arthropoda

  3. Phylum Arthropoda • Phylum includes crustaceans, insects, and chelicerates • Chelicerates • Primarily terrestrial • Also horseshoe crabs and sea spiders • Crustaceans • Marine and freshwater, absent from land Phylum Arthropoda

  4. Arthropod Characters • Arthropods have segmented bodies with some or all of the segments bearing jointed appendages • Appendages are specialized for: Phylum Arthropoda

  5. The Wonders of Chitin • All arthropods have a chitinous jointed exoskeleton • How is this detrimental and beneficial? Phylum Arthropoda

  6. Molting (Ecdysis) Phylum Arthropoda

  7. Arthropod Segments • Arthropod segments are grouped into body regions • Some have two regions • Cephalothorax, and abdomen • Some have three regions • Head, thorax, abdomen • Many regions have multiple appendages • Appendages are modified for a particular function Phylum Arthropoda

  8. Arthropod Appendages • The head usually contains pairs of joint appendages, which are sensory and used in feeding • Antenna’s or feelers are first • Followed by the jaws and mandibles which are used for biting and chewing • Mandible and accessory mouth parts aid in handling the food and moving it towards the mouth Phylum Arthropoda

  9. Arthropod Appendages

  10. Arthropod Vision • Simple eyes • Light sensitive cells share a common lens • Compound eyes • Thousand of closely packed units called ommatidia Phylum Arthropoda

  11. Compound & Simple Eyes Phylum Arthropoda

  12. Digestive system • Most arthropods have three main regions: foregut, midgut and hindgut Phylum Arthropoda

  13. Respiration and Circulatory System • Extensive surface areas are needed to supply the large oxygen demands of most arthropods • Gills can occur both inside and outside of the of the carapace • Circulatory System • Open circulatory system as in molluscs, hearts vary in structure but do exist • Blood is pumped into empty spaces bathing the tissues in blood Phylum Arthropoda

  14. Nervous System and Reproduction Phylum Arthropoda

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