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Phylum Arthropoda

Phylum Arthropoda. Keith Power. The Arthropods. Arthropods are by far the most successful of all animals Well over 1,000,000 species Some say over 30 million species of insects alone! There are around 200 million individual insects alive at any given time for each human!

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Phylum Arthropoda

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  1. Phylum Arthropoda Keith Power The Arthropods

  2. Arthropods are by far the most successful of all animals • Well over 1,000,000 species • Some say over 30 million species of insects alone! • There are around 200 million individual insects alive at any given time for each human! • Arthropods exhibit these key features: • Exoskeleton: made of chitin, and must be molted (shed) in order to grow • Segmentation: the body is divided into sections • Jointed appendages: (arthropod means ‘jointed feet’) they may be modified into antennae, mouthparts or legs! UC Berkeley

  3. Key features of Arthropods cont. • Circulatory System: they have an open circulatory system (no veins or arteries) but a heart is present • Nervous system: they have a brain but also ganglia are in each segment. This results in the arthropod being able to carry out functions like eating, moving and reproducing without a brain present! • They also have compound eyes: hundreds or more of independent eyes www.teachersparadise.com

  4. Key features of Arthropods cont. • Respiratory System: Marine arthropods have gills • Spiders have book lungs (leaf-like plates within a chamber) • Terrestrial arthropods have tracheae (small branched ducts that eventually network to each cell) with the opening to the air called spiracles • Excretory System: aquatic arthropods diffuse most waste through gills, terrestrial insects have Malpighian tubules (slender projections from the digestive tract into the blood, wastes diffuses into them) 2004, Pearson Education

  5. Spiracles and trachea: Malpighian tubules: McGraw-Hill

  6. Digestion/feeding: varied and complex, range from predators to herbivores, complete digestive system present • Reproduction: sexual, lay eggs, may include metamorphosis • Movement: jointed appendages! Fly, walk, or swim Peter Pitman

  7. Class Chelicerata: spiders, mites, ticks, horseshoe crabs

  8. Class Crustacea: crabs, shrimps, lobsters, and pill bugs The Kids Window

  9. Class Crustacea: crabs, shrimps, lobsters, and pill bugs

  10. Class Crustacea: crabs, shrimps, lobsters, and pill bugs

  11. Class Crustacea: crabs, shrimps, lobsters, and pill bugs

  12. Class Crustacea: Even barnacles!

  13. Crustacea anatomy: the crayfish • Chelipeds: for defense and prey capture • Swimmerets: for locomotion and reproduction (holds eggs) kentsimmons.uwinnipeg.ca

  14. Class Hexapoda: The insects!

  15. Class Hexapoda: The insects!

  16. Insect Anatomy: • Body divided into three segments: head, thorax and abdomen • Mandible for crushing food

  17. Class Myriapoda: Centipedes and Millipedes

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