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Exploring Arthropoda: Diverse Invertebrate World

Discover the fascinating world of Phylum Arthropoda, known as "jointed foot," with its basic features, molting process, different subphyla, anatomy, physiology, and behavior. Explore the varied aspects such as feeding, circulation, gas exchange, water balance, and reproduction in arthropods.

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Exploring Arthropoda: Diverse Invertebrate World

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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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