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An Introduction to Animal Diversity. What Is an Animal? An Overview of Animal Phylogeny and Diversity The Origins of Animal Diversity. What Is an Animal?.

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An Introduction to Animal Diversity


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an introduction to animal diversity

An Introduction to Animal Diversity

What Is an Animal?

An Overview of Animal Phylogeny and Diversity

The Origins of Animal Diversity

what is an animal
What Is an Animal?
  • Multicellular, eukaryotic, heterotrophic, ingestion feeder, stores glycogen, nervous system, no cell walls, muscle system, sexual, flagellated sperm, dominant diploid
  • Zygotecleavageblastulagastrula larva with metamorphosis
overview of animal diversity and phylogeny
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
parazoa
Parazoa
  • Sponges
  • “beside the animals”
  • Simple aquatic and marine forms
eumetazoa
Eumetazoa

Two major branches:

  • 1. Radiata-radial symmetry, top and

bottom, no front, back, or sides,

diploblastic larva

  • 2. Bilateria-bilateral symmetry, triploblastic,

cephalization

importance of coelom
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
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

Protostomes and Deuterostomes
the origins of animal diversity
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

videos and websites
Videos and Websites
  • http://animaldiversity.ummz.umich.edu/site/index.html