Chapter 32 INTRODUCTION TO ANIMALS

Chapter 32 INTRODUCTION TO ANIMALS -...

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Chapter 32 INTRODUCTION TO ANIMALS Eating, moving organisms Summary *Why study animals? *General Characteristics of Animals *Phylogeny *Based on Morphology *Based on DNA analysis *Evolutionary developments General Characteristics of Animals *Multicellular organisms *Cells lack cell walls *Heterotrophs or consumers *Ingestors *Self directed movement *Muscles *Nerves *Body plan has 4 features *Symmetry and cephalization *Tissue layers *Embryonic development *Body Cavity  Subgroups show differences in  *Limb structures *Feeding structures *Small to very large, diverse and abundant, live in every type of ecosystem. *Life cycle is predominated by the diploid organism; haploid stage – gametes  (cells). Phylogeny 1
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*Animals (all together) form a monophyletic group. *How would you start to classify a large, diverse group of animals into groups? Phylogeny – Based on Morphology *Fossil records *Major fossils from 500-600 million years ago (Cambrian Explosion) support  morphological phylogeny for the most part. *rRNA data first reported in 1997 shows a few differences, fig 32.10.  The work is 
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