Bio153_lecture12_Intro_anim_sv - Origin of Animals...

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Origin of Animals Evolution of Animals • After the split between the protostomes and the deuterosteomes, the protostomes split to form two major subgroups, the Ecdysozoa and the Lophotrochozoa Themes in the Diversification of Animals? • Within each animal phylum, the basic features of the body plan do not vary from species to species • The diversification of species within each lineage was triggered by the evolution of … Innovative Methods for Feeding 1. suspension (filter) feeders – filter particles using a wide array of structures 2. deposit feeders - eat through a substrate 3. fluid feeders – liquids: 4. mass feeders – chunks of food Innovative Methods for Feeding What Animals Eat algae or plants other animals detritus a) mouthparts vary b) structure of mouthpart correlates with method of feeding Suspension Feeders Harvest Suspended Food Krill filter feed using their legs. Legs
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Baleen whales filter feed using their baleen. Baleen Deposit Feeders Eat Their Way Through a Substrate Earthworms (Annelida) eat their way through soil. Deposit Feeders Eat Their Way Through a Substrate Sea cucumbers eat their way through organic deposits. Fluid Feeders Drink Liquids Butterflies have an extensible, hallow proboscis. Blowflies have an extensible, sponge-like mouthpart. Mass Feeders Ingest Bites or Lumps of Food Horses feed on grass stems. Terrestrial snails feed on leaves. Radula scrapes off
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This note was uploaded on 02/01/2012 for the course BIOLOGY 153 taught by Professor Dr.arts during the Fall '10 term at University of Toronto.

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Bio153_lecture12_Intro_anim_sv - Origin of Animals...

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