Ch 32 Body Plans - Animal Body Plans Criteria for...

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Animal Body Plans
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Criteria for Evolutionary Cellular organization Symmetry Coelom Digestive system Segmentation Cephalization
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Kingdom Animalia Symmetry Unorganized Radial Bilateral Cellular organization Tissues, organs, systems
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Coelom Body cavity or not Digestive system None, 1 or 2 openings, how Kingdom Animalia coelom digestive tube
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Segmentation Repetition of body parts Cephalization Development of a “head end” Kingdom Animalia
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1 st dinosaur end of dinosaurs 1 st reptiles 1 st amphibians 1 st land plants 1 st fish 1 st invertebrates Millions of Years Geologic Time Scale
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Ediacaran Fauna : distinctive group of fossils dating from and existing only during Precambrian time The fauna arose about 600 mya. Named for Australia's Ediacara hills, where it was first discovered. Such fossils were later found to be widespread. These animals lived in shallow seas and had soft bodies that bear little resemblance to later life forms, and were about 1 m in length. May be an evolutionary dead end
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Reconstruction of the sea floor during the Vendian times when the Ediacaran organisms thrived
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Ediacaran Fauna (600-540 MYBP) end of Precambrian era
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Edicarian Fauna
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Ancient Seas at the During the Cambrian Radiation (540 MYBP) Burgess Shale
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Ancient Seas at the During the Cambrian Radiation (540 MYBP) Drawings based on fossils collected from Burgess Shale in British Columbia, Canada
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Burgess Shale Fauna (540 MYBP) An explosion of body plans Hallucigena Feeding tentacles spines Similar to a sea urchin
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Pikaia- earliest known chordate Burgess Shale Fauna (540 MYBP)
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Burgess Shale Fauna (540-530 MYBP Anomalocaris Opabinia Wiwaxia
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Living Invertebrates
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Phylogentic Relationships of Animals Ancestral Protist segmentation true tissue radial symmetry bilateral symmetry Deuterostomes: eucoelom Protostome: schizocoelem pseudo coelom Porifera Cnideria Platyhelminthes Nematoda Mollusca Annelida Echinodermata Chordata Arthropoda no true tissues acoelom
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Embryonic Development of an Animal
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Ch 32 Body Plans - Animal Body Plans Criteria for...

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