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Overview of Arthropods: Jointed-Foot Creatures

Learn about the characteristics of arthropods, including their exoskeleton, appendages, and respiratory structures. Explore examples of arachnids, crustaceans, centipedes, millipedes, horseshoe crabs, and insects.

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Overview of Arthropods: Jointed-Foot Creatures

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  1. Arthropods The “Jointed Foot” Creatures

  2. Characteristics of Arthropods • Arthropods have an exoskeleton made of Chiton and Proteins, Bilateral Symmetry, Coelomate, and jointed structures called Appendages. • The appendage can be used for a variety of functions including: sensing, walking, feeding and mating. • Arthropods must molt to grow.

  3. Respitory structures • Arthropods have a variety of methods of Respiration. • Draw the 3 examples of them on page 764 in the Biology textbook. • Many have simple eyes (used for light detection) and compound eyes. • Terrestrial arthropods excrete waste through Malpighian tubules located on the abdomen. • Some Arthropods reproduce by Parthenogenesis, development of an unfertilized egg.

  4. Arachnids • Spiders, Scorpions, Mites and ticks • First set of appendages are called the Chelicerae which often are modified into pincers or fangs. • Second appendages are called pedipalps which handle food or are used for sensing. • 2 major body segments: Cephalothorax and abdomen.

  5. Camel Spider Pictures from Iraq

  6. Crustaceans • Only group of arthropods that have 2 sets of antennae for sensing. • Jaws move from side to side. • Eyes located on Stalks. • Include: Crabs, Lobsters, Shrimp, Crayfish, barnacles, water fleas and sow bugs and pill bugs. • Most breath through sets of feathery gills underneath a carapace.

  7. Water Fleas

  8. Centipedes and Millipedes • Centipedes, class Chilopoda are all carnivores. Bites can be painful to humans. Malpighian tubules are used for waste. • Millipedes, class Diplopoda are herbivores that feed on decaying materials. Millipedes do not bite but can emit an obnoxious smell if disturbed.

  9. Horseshoe Crabs • Class Merostomata • Very Ancient animals unchanged since the Cambrian era (500 million years ago) • Feed on seaweed, worms and molluscs. • Have blue blood due to the chemicals in it. • Draw a picture on page 771 of the horseshoe crab.

  10. Insects • Class Insecta- Only one species is Marine • Almost 7/10 animals are Insects! • All insects undergo some form of metamorphosis. • Draw the picture of the Grasshopper on page 772 and label and explain the function of the following body parts: Antennae, Tympanum, Malpighian Tubules, Spiracles.

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