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Invertebrates 4

Invertebrates 4. Phylum Arthropoda. Phylum Arthropoda: “jointed foot”. Basic Arthropod Features (cont.). Paired, jointed appendages joints allow for flexibility Segmentation In some, have similar segments throughout body In most: Segments combined into specialized body regions

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Invertebrates 4

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  1. Invertebrates 4 Phylum Arthropoda

  2. Phylum Arthropoda:“jointed foot”

  3. Basic Arthropod Features (cont.) • Paired, jointed appendages • joints allow for flexibility • Segmentation • In some, have similar segments throughout body • In most: Segments combined into specialized body regions • Crustaceans have 2 regions: cephalothorax, abodomen • Insects have 3 regions: head, thorax and abdomen • Exoskeleton • Same materials also in mouthparts, wings, eye lens

  4. Focus on Molting • Function: growth • New exoskeleton built under old • stretching by water or air in the digestive system and hemocoel • vulnerable to predators while hardening • mating can coincide with soft shell in female crabs • Some arthropods grow all life • Hormonal control

  5. Subphylum Crustacea • Examples: Lobsters, crabs, shrimp, barnacles, copepods, etc..

  6. Subphylum Unirama • Insects, centipedes, millipedes

  7. Subphylum Chelicerata • Spiders, mites, scorpions, horseshoe crabs

  8. Various aspects of anatomy, physiology and behavior • Feeding • Class Crustacea • Class Insecta • Subphylum Chelicerata • Circulation/gas exchange • Open circulatory system • Respiration varies amongst subphyla and classes • Class Crustacea: gills • Class Insecta: tracheal system. CARRIES OXYGEN AND CO2 • Subphylum Chelicerata: tracheal system, book gills and book lungs • Water/ion balance and ammonia excretion • Crustacea: gills and green glands • Insecta and Chelicerata: Malpighian tubules

  9. Various aspects of anatomy, physiology and behavior • Nervous system • Cerebral ganglia • Ventral nerve cord (paired, fused) • Ganglia in each segment , or one ganglion for several segments • Reproductive systems • Usually internal fertilization • Spermatophores • Sperm storage

  10. Review: Features

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