Biol 224 Theme 1

  1. Word "Animal" in Latin
    • -from latin word animalis, meaning with soul
    • -also meaning "having breath"
  2. Motile Animals
    -means that they can move spontaneously and independently
  3. Sessile Species
    • -ex. barnacles
    • -use bristled appendages to obtain food
    • -many adults are immobile, whereas the larvae can swim
  4. Monophyletic
    -all taxa in the animal kingdom evolved from a single common ancestor
  5. Eumetazoa
    • -all animals with a body made up of differentiated cells arranged in tissues
    • -include a nervous system and muscles
    • -organs
    • -separate cell layers
  6. Paraazoa
    • -sponges
    • -unique in having some differentiated cells that can transform into other cell types
  7. Sponges
    • -sessile animal of phylum Porifera
    • -bodies consist of connective tissue in the form of a gelatinous matrix
    • -walls lined with small pores called ostia which allows water to flow through the body
    • -no muscles nervous, digestive, or circulatory systems
  8. True Coelom
    -body cavity completely lined with mesoderm
  9. Pseudocoelom
    -coelom is not completely lined by tissue derived from mesoderm
  10. Acoelomates
    • -lack a body cavity
    • -fluid filled body cavity that protect internal organs or used as hydrostatic skeleton
  11. Radiata Animals
    • -radially symmetrical animalsĀ 
    • -can be divided equally along any plane passing through the central axial axis
    • -often circular or tubular with a mouth at one end
  12. Bilateria
    • -bilaterally symmetrical animals
    • -can be divided along vertical line making two halves, left and right(mirror images)
    • -also have a dorsal(upper) and ventral(lower) side (not mirror images)
    • -anterior(head) and posterior(tail)
    • -oral(top) and aboral(bottom)
  13. Cephalization
    • -location of sensory structures at the anterior end of the body
    • -permitted animals to encounter environment head on
  14. Alimentary Plan
    • -body "pipe" plan
    • -mouth at one end, anus or cloaca at the other
    • -very common plan
    • -allows nutrition capture, digestion and waste removal
  15. Tetrapods
    • -four footed
    • -can include modified front limbs ie. birds, bats etc
  16. Insects
    • -invertebratesĀ 
    • -six legs
    • -three body partsĀ 
    • -exoskeleton
  17. Cephalopods
    • -no skeleton
    • -hydrostatically stiffened tentacles
    • -propulsion by squeezing water out of mantle cavity
  18. Echinoderms
    • -fivefold radial symmetry
    • -external skeleton
Card Set
Biol 224 Theme 1
Theme 1