Bio1152 Chapter 32 An Introduction to Animal Diversity
  1. Animals are multicellular,                eukaryotes that ingest their food.

     
     
     
     
  2. The ancestor of animals diverged from those of        about 1.2 billion-800 million years ago, and may have resembled modern                    .



     
     
     
     
  3. The kingdom diversified about 525 million years ago, during the           explosion, when many animal phyla appeared.

     
     
     
     
  4. Animals can be categorized by how their cells are organized according to a       plan.

     
     
     
     
    •         symmetry is like a flower pot, the body radiates from the center.

       
       
       
       
    •            symmetry has a single plane of symmetry.

       
       
       
       
    • Most animals have          that develop from embryonic layers of the           .



       
       
       
       
    • Diploblastic animals such as jellyfish have      germ layers:           and           . Triploblastic animals have        germ layers, including a           .



       
       
       
       
    • The mesoderm may develop into tissue that line a fluid-filled space called a         .

       
       
       
       
      • A               is a body cavity only partially lined by mesoderm tissues.

         
         
         
         
      • Organisms without a body cavity are considered              .


     
     
     
     
  5. The coelomates show two major modes of development.
     
     
     
     
    • Protostomes develop their        from the blastopore of the gastrula.

       
       
       
       
    • Deuterostomes develop their       from the blastopore.


     
     
     
     
  6. Current phylogeny places            as a clade with true          , and divides the Bilateria into three clades:                , Lophotrochozoa, and Ecdysozoa.



     
     
     
     
Bio1152 Chapter 33 Invertebrates
  1. Invertebrates do not have a           , and account for 95% of known animal species.



     
     
     
     
  2. Phyla           and          are the multicellular sponges (formerly Porifera) that lack true tissues. Fertilization is external:

     
     
     
     
  3. Phylum           belongs in the clade with true          called            .















     
     
     
     
  4. Most Eumetazoa belong to the clade            and exhibit            symmetry and triploblastic embryonic development.
     
     
     
     
  5. Phylum                  are flatworms with a gastrovascular cavity.







     
     
     
     
  6. Phylum           are roundworms with a               .





     
     
     
     
  7. Phylum           are tiny animals, smaller than many protists.

     
     
     
     
  8. Phylum           are soft-bodied animals.









     
     
     
     
  9. Phylum           are segmented worms with a true         .







     
     
     
     
  10. Phylum             have            bodies.











     
     
     
     
  11. Phylum                are                .