Invertebrates (Non-arthropods)

• why can invertebrates live more sophisticated lives?

  they have coeloms
• what is a coelom?

  a cavity with the organs inside surrounded by the mesoderm tissue
• name four non-arthropod invertebrate phylums?

  Mollusca, annelida, nematoda and echinodermata
• what is the phylum annelida comprised of?

  Segmented worms
• name four of the species in the phylum annelida?

  fan worms, bristle worms, earthworms and leeches
• what type of symmetry is seen in the phylum annelida?

  bilateral
• what is the phylum nematoda comprised of?

  roundworms
• what does nemato mean?

  threadlike
• does the phylum Nematoda have a cavity?

  yes it has an internal cavity, however the internal organs are not surrounded by mesoderm
• what is the phylum echinodermata?

  not a real taxonomy, just all of the invertebrates which are not arthropods grouped together
• what does "echin" mean?

  Spiny
• what does "derma" mean?

  skin
• name four of the species which come under the phylum echinodermata?

  Starfish, sea urchins, sand dollars, sea cucumbers
• what symmetry is seen in the phylum echinodermata?

  bilateral in larvae, but 5 fold radial in adults