an introduction to animal diversity what is an animal? an overview of animal phylogeny and...
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An Introduction to Animal Diversity
What Is an Animal?An Overview of Animal Phylogeny and DiversityThe Origins of Animal Diversity
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What Is an Animal?
Multicellular, eukaryotic, heterotrophic, ingestion feeder, stores glycogen, nervous system, no cell walls, muscle system, sexual, flagellated sperm, dominant diploid
Zygotecleavageblastulagastrula larva with metamorphosis
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Figure 32.1 Early embryonic development (Layer 1)
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Overview of Animal Diversity and Phylogeny
Diversified during Precambrian and Cambrian periods
Monophyletic Parazoans-first branch, lack true tissues Radiata and bilateria two major branches of
Eumetazoa Evolution of body cavities Protostomes and deuterostomes
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Parazoa
Sponges “beside the animals” Simple aquatic and marine forms
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Eumetazoa
Two major branches: 1. Radiata-radial symmetry, top and
bottom, no front, back, or sides,
diploblastic larva 2. Bilateria-bilateral symmetry,
triploblastic,
cephalization
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Importance of Coelom
Acoelomates-no body cavity, Platyhelminthes Pseudocoelomates-fluid filled body cavity,
partially lined with mesoderm, Nematoda Coelomates-fluid filled, completely lined with
mesoderm, Annelida Coelom-body cavity that protects internal organs
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Protostomes and Deuterostomes
Protostomes: Mollusks, Annelids,
Arthropods Spiral cleavage Determinate cleavage Blastopore forms the
mouth schizocoelous
Deuterostomes: Echinoderms and
Chordates Radial cleavage Indeterminate
cleavage Blastopore forms the
anus Enterocoelous
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The Origins of Animal Diversity
Colonial protist origin during Cambrian Explosion Evidence from fossil beds: Burgess Shale,
Yunnan region, Greenland Why such rapid diversification?
1. Adaptive radiation
2. Predator-prey relationships
3. Higher concentration of oxygen
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Videos and Websites
• http://animaldiversity.ummz.umich.edu/site/index.html