Lecture24_AnimalsII - I. An introduction to protostomes A....

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Animals II II. Animals as moving and feeding machines • Plants stay in one place but grow continuously; they take in • Fungi stay in one place but grow continuously; they (usually) • Animals move around and take in A. Methods of moving Need: something to exert a force and something to exert a force against In animals, muscles exert force against one of three types of skeletons 1. Hydrostatic skeleton = 2. Exoskeleton = 3. Endoskeleton = B. Methods of feeding 1. Source of food a. Dead organisms: b. Living organisms Distinguishing parasitism and predation: 2. Strategies a. Parasitism Ectoparasites: Endoparasites:
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b. Predation e.g. members of dog family members of cat family c. Other feeding strategies • Deposit feeding: Question: Why do bodies of deposit feeders tend to be tube-like? • Suspension feeding:
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Unformatted text preview: I. An introduction to protostomes A. Who are these guys? 1. Morphology a. ~20 phyla, most marine and most with The Big Two b. Arthropods exoskeleton: segmented body: jointed limbs: c. Molluscs muscular foot: visceral mass: mantle: Question: Why do arthropods and mollusks have a drastically reduced coelom? 2. Phylogeny Two major lineages of protostomes: Ecdysozoans: grow by molting Lophotrochozoans: may have feeding apparatus called a lophophore and trochophore larvae (distinctive morphologically) B. Whats cool about protostomes? Water-to-land transition: multiple events Arthropods Molluscs Roundworms Annelids Metamorphosis Question: What is the adaptive significance of holometabolous metamorphosis?...
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Lecture24_AnimalsII - I. An introduction to protostomes A....

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