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Unit 5: The Evolutionary History of Diversity Invertebrates Review
  1. Invertebrates do not have a , and account for 95% of known animal species.
     
     
  2. Phylum are the multicellular sponges. A single layer develops into specialized cells such as , , and .
     
     
  3. Phylum belong in the clade with true called . This phylum is diploblastic and is divided into four major classes: Hydrozoa, Scyphozoa, Cubozoa, and Anthozoa.
     
     
  4. Most Eumetazoa belong to the clade and exhibit symmetry and triploblastic embryonic development.
     
     
  5. Phylum are flatworms with a gastrovascular cavity that lacks a . The classes are: Turbellaria, Monogenea, Trematoda, and Cestoidea.
     
     
  6. Phylum are roundworms with a and a tough coat called a covering the body. Some nematodes are parasites of plants and animals; human parasites include Trichinella, Ascaris, and filarial nematodes.
     
     
  7. Phylum are segmented worms with a true . The major classes are: Oligochaeta, Polychaeta, and Hirudinea.
     
     
  8. Phylum are soft-bodied animals whose body consist of a muscular , a visceral , and a . A ciliated larval stage called a places this phylum in the clade . The major classes are: Gastropoda, Bivalvia, Cephalopoda, and Polyplacophora.
     
     
  9. Phylum have bodies with appendages and an made of . The exoskeleton requires them to as they grow, placing them in the clade . The major subphyla are: Cheliceriformes, Myriapoda, Hexapoda, and Crustacea.
     
     
  10. Phylum are and possess a bumpy or spiny skin that covers an , and a vascular system. The classes are: Asteroidea. Ophiuroidea. Echinoidea, Crinoidea, Holothuroidea, and Concentricycloidea.
     
     
    Summary.
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