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Arthropod Notes

Arthropod Notes. Arthropod Characteristics. “anthron” = joint “podos” = foot segmented body tough exoskeleton jointed appendages. Growth. Exoskeleton – suit of armor that protects and supports the body. Molting:

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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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