Animal%20Diversity - PowerPoint PPT Presentation

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Animal%20Diversity

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Animal Diversity Classification: Level of organization Type of symmetry Germ layers Coelom (+/-, type) Development Levels of organization Cellular Aggregations of ... – PowerPoint PPT presentation

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Title: Animal%20Diversity


1
Animal Diversity
  • Classification
  • Level of organization
  • Type of symmetry
  • Germ layers
  • Coelom (/-, type)
  • Development

2
Levels of organization
  • Cellular
  • Aggregations of unspecialized cells
  • Tissue
  • Specialized cells separated by membranous layers.
  • Organ
  • Two or more tissues working together

3
Symmetry
  • Classification by architecture
  • Asymmetrical, Radial, Bilateral
  • Cephalization

4
Germ layers
Diploblastic Triploblastic
Ectoderm Endoderm Ectoderm Mesoderm Endoderm


5
Coelom body cavity Function?
  • Hydrostatic skeleton
  • Space for organ differentiation
  • Protection of organs
  • Freedom of movement

6
Body cavity (coelom)
  • Acoelomate
  • No central body cavity
  • Pseudocoelomate
  • Coelom derived from endoderm mesoderm
  • Eucoelomate (coelomate)
  • Coelom lined with mesoderm

Platyhelminthes
7
Development(check your text for illustrations!)
Protostome Deuterostome
First mouthBlastopore mouth Second mouthBlastopore anus
Spiral cleavage, determinate cell division Radial cleavage, indeterminate cell division
Schizocoelus(coelom from split in mesoderm) Enterocoelus(coelom from outpocketing of mesoderm)
8
Segmentation
  • Metamerism
  • Serially repeated segment
  • Division of labor/specialization
  • Annelids, Arthropods, Chordates

9
Can you read a tree like the ones we had on the
display boards? (Are you sure?) Try and find a
tree with these traits Level of organization,
Type of symmetry, Germ layers, Coelom,
Development and the major animal phyla to make
sure!
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