Summary of Animal Phyla

Summary of Animal Phyla - Summa ry of Animal Phyla...

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Unformatted text preview: Summa ry of Animal Phyla Porifera (sponges) Lack t rue t issues Have chanocytes o Collar cells unique f lagellated cells that ingest bacteria and tiny food particles Cnidar ia (hydras, jellies, sea anemones, corals) Unique stinging structures (cnidae) Each housed in a specialized cell (cnidocytes) Gastrovascular cavity (digestive compartment with a single opening) Platyhelminthes Dorsoventrally f lattened Unsegmented acoelomates Gastrovascular cavity or no digestive t ract Rotifera (rotifers) Pseudocoelomates with alimentary canal (digestive tube with mouth and anus) Jaws (trophi) in pharynx Head with ciliated crown Mollusca Coelomates with 3 main body parts (muscular foot, visceral mass, mantle) Coelom reduced Most have shell made of calcium carbonate Annelida (segmented worms) Coelomates with body wall and internal organs (except digestive t ract) Segmented Nematoda (roundworms) Cylindrical, unsegmented pseudocoelomates with tapered ends No circulatory system Arth ropoda (crustaceans, insects, spiders) Coelomates with segmented body Joined appendages Exoskeleton made of protein and chitin Deuterostomia 1. Echinodermata (sea urchins, sea stars) Coelomates with secondary radial symmetry (larvae bilateral; adults radial) Unique water vascular system Endoskeleton 2. Chordata (lancelets, tunicates, vertebrates) Coelomates with notochord Dorsal, hollow nerve cord Pharyngeal slits Muscular, post-anal tail ...
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This note was uploaded on 05/08/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Summary of Animal Phyla - Summa ry of Animal Phyla...

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