An Introduction to Animal Diversity and Invertebrates By Genetically Superior™
Animal Diversity: Invertebrates Chapter 25
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Transcript of Animal Diversity: Invertebrates Chapter 25
Animal Diversity: Invertebrates Chapter 25
Animal Diversity:Invertebrates
Chapter 25
Sponges
Jelly fish
Coral
Worms
Mussels
Insects
What makes an animal an animal?What are the evolutionary milestones that led to bodies of modern animals?Tissue FormationFormation of a three-layer animal embryo
Formation of a three-layer animal embryo
Body Symmetry
Gut and Body Cavities
Bilateral organisms develop in one of two waysProtostomeDeuterostomeBoth represent distinct evolutionary groups within bilateral animalsCirculation
Segmentation
Understanding Evolution. 2011. http://evolution.berkeley.edu/evolibrary/article//arthropods_05
AbsoluteAstronomy. 2011. http://www.absoluteastronomy.com/topics/Segmentation_(biology)Choanoflagellates
Science Notes. 2008. New York Times. http://sciencenotes.wordpress.com/2008/03/06/choanoflagellates-to-sponges-to-metazoa/
Carroll, Sean B. 2010. http://www.nytimes.com/2010/12/14/science/14creatures.html?_r=1
Devitt, Terry. 2001. University of Wisconsin-Madison News. http://www.news.wisc.edu/6920Choanoflagellates
Relationships and Classification
The Simplest Living AnimalPlacozoans, the simplest known animals, have no body symmetry, no tissues, and just four different types of cells Example: Trichoplax adherens
14Phylum Porifera - Sponges Only animal to lack tissuesIndividual cells have specialized functions but do not act as a specialized group of cells or tissueSuggests that the evolutionary split between sponges and all other animals occurred early Ancient common ancestor gave rise to both sponges and tissue containing animals
2 Major Categories of AnimalsVertebrates (vertebral column)Invertebrates (no vertebral column)Major Invertebrate PhylaPoriferaCnidariaPlatyhelminthes Nematoda Rotifera AnnelidaMolluscaArthropodaEchinodermata
Sponges Phylum Porifera
Sponge Body Plan
Phylum Cnidaria
Hydrozoan
Jellyfish
Corals
Sea anemone
Two Cnidarian Body Plans
Cnidarian Diversity
Flatworms Phylum Platyhelminthes
Phylum Platyhelminthes Schistosoma Blood Fluke
Phylum Platyhelminthes - Tapeworm