BIOL 112 Lecture Notes - Lecture 1: Gill Slit, Swim Bladder, Filter Feeder
4 May 2016
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Biol 112 unit 4 notes: arthropods, ecdysozoans, onychophora flexible cuticle w/ chitin (sheds as it grows) Velvet worms, ancient group close to arthropods. Segmented cylindrical body w/ many legs, but legs are soft and unjointed legs have tiny claws on them, predators in tropical forests: tardigrada. Piercing mouthparts feed on plant and animal cell fluids. Segmented with chitinous cuticle that sheds, but w/ 4 stubby, unjointed legs, very. Water bears small (<0. 5 mm) live in water films on mosses and soils. Have a cuticle that must be molted as they grow, can survive extreme conditions in a dormant state. 2% water: can be dehydrated for years, can survive extreme temperatures, can survive high or low pressures, even in outer space, can even survive radiation, arthropoda. Segments are usually highly specialized, segmented body with a hard exoskeleton and jointed appendages tough cuticle made of chitin & proteins thick and hard for support, protection and attachment of muscles, thin at joints.
