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Arthropod Notes

Discover intriguing details about arthropods, their jointed appendages, segmented bodies, and tough exoskeletons. Learn about molting, growth, and the unique characteristics of crustaceans, horseshoe crabs, sea spiders, and insects.

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Arthropod Notes

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  1. Arthropod Notes

  2. Arthropod Characteristics • “anthron” = joint • “podos” = foot • segmented body • tough exoskeleton • jointed appendages.

  3. Growth • Exoskeleton – suit of • armor that protects • and supports the body. • Molting: • Skin glands digest inner part of exoskeleton. Other glands make a new skeleton • Animal sheds old exoskeleton. • While the new exoskeleton is soft, the animal fills with air or fluid to allow room for growth before skeleton hardens.

  4. Life Functions

  5. 1. Crustaceans • Examples: shrimp, crabs and lobsters. 150,000 species. • 2 pairs of branched antennae • 2 or 3 body sections • Chewing mouthparts. • Dominate group of arthropods in the ocean. Coconut crab

  6. 2. Horseshoe Crabs • living fossil • Blue blood because it has copper in it. • 200 flattened gills (book gills) • The medical profession uses an extract from the horseshoe crab's blue, copper-based blood called lysate to test the purity of medicines • the tail is used to plow the crab through the sand, to act as a rudder, and to right the crab when it accidentally tips over. • Female lays 20,000 eggs in the sand and the male fertilizes them.

  7. 3. Sea Spiders • Sea Spiders – feed on sea anemones • Most are tiny and crawl on sessile plants and animals.

  8. 4. Insects • dominate group of arthropods on land

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