BIOL108 Lecture Notes - Lecture 25: Horseshoe Crab, Cephalothorax, Book Lung

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Biol 108 - lecture #25 - arthropoda pt. Myriapods: 3 pairs of legs, less tagmatized. Trunk: 9 - 325 pairs of jointed legs: direct development, all terrestrial. 1 pair of modified legs behind the mouthparts. Poison claws: subdues prey or fight predators. Some are poisonous to humans: diplopoda. Some may suck out fungal hyphae contents. Horseshoe crabs, scorpions, spiders, mites, and relatives. Chelicerae as the main mouthparts: 2 or 3 segmented pincers. 2 main tagmata (some taxa may have more or fewer: cephalothorax. Can be completely or partially covered by the carapace. Handle food or transfer the sperm to females. Class arachnida: spiders, mites, scorpions, etc. Digests solids into liquids before they can eat it. Tight constriction between the cephalothorax and the abdomen. Spinnerets: abdominal appendages, used for spinning silk. Used to capture prey, escape danger, transport themselves. Also allows them to line burrows and wrap eggs. Allows them to crush/sting prey to death.