Biology 242: Lecture 3Spring 2001

Invertebrates II

  1. Phylum Rotifera

  2. Phylum Nematoda = round worms

  3. Phylum Mollusca
    1. Characteristics
    2. Major groups
      1. Class Polyplacophora = chitons
      2. Class Gastropoda = snails, slugs
      3. Class Bivalvia = clams, oysters, mussels, scallops
      4. Class Cephalopoda = squid, octopuses, nautiluses
    3. Economic importance

  4. Phylum Annelida
    1. Characteristics
    2. Major groups
      1. Class Oligochaeta = earthworms
      2. Class Polychaeta
      3. Class Hirudinea = leeches
    3. Economic importance

  5. Phylum Arthropoda
    1. Characteristics
    2. Major groups
      1. Subphylum Trilobitomorpha
      2. Subphylum Cheliceriformes
        1. Class Merostomata = horseshoe crabs
        2. Class Arachnida = spiders, scorpions, ticks, mites
      3. Subphylum Uniramia
        1. Class Diplopoda = millipedes
        2. Class Chilopoda = centipedes
        3. Class Insecta
      4. Subphylum Crustacea = crabs, shrimp, barnacles, copepods
    3. Economic importance


"I do not feel obliged to believe that the same God who has endowed us with
sense, reason, and intellect has intended us to forgo their use."
Galileo