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Life Before the Dinosaurs Part 3

Life Before the Dinosaurs Part 3 -...

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Silurian Typical invertebrate fauna as in Cambrian and Ordovician Eurypterids, “sea scorpions” evolve Jawless fish abundant and very diverse Arthropods abundant on land Primitive plant fossils Anaspids, one type of jawless fish www.tolweb.org/tree/ToLimages/anaspida.gif A eurypterid fossil earth.geology.yale.edu/~deb47/pics/eurypterid.jpg Cooksonia petroni , a Silurian land plant www.xs4all.nl/~steurh/engplant/cookspb.html www.biologie.uni-hamburg.de/b-online/library/steur/cookson3.jpg soils.usda.gov/sqi/concepts/soil_biology/images/ORTHOPOR_LR.jpg Millipedes are found on land
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Devonian Period Typical invertebrate fauna as in Cambrian and Ordovician Jawed fish evolve- including placoderms, cartilaginous fish, bony fish First amphibious tetrapods Land plants diversify- including horse tails, club mosses, ferns, etc. Dunkleosteus a placoderm fish ACM 11751c Reconstructions of fossil Devonian plants
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Unformatted text preview: www.devoniantimes.org/who/pages/ferns.html Acanthostega and Ichthyostega early tetrapods palaeo.gly.bris.ac.uk Carboniferous Period Jawless fish go extinct, so do placoderms, other jawed fish still diverse Amphibians diversify Coal swamps prolific First amniotes- animals with a self-contained egg geology.ohio-state.edu/~vonfrese/gs100/lect33/xfig33_20.jpg Amphibian footprints, Plainville, MA Permian Period Amniotes are prolific and diversify into anapsids, synapsids, and diapsids Anapsids- no secondary holes in skull www.sanybel.com/Green_skull.jpg Synapsids- one set of holes in skull; ultimately give rise to mammals palaeos.com/Vertebrates/Units/Unit390/Images/Edaphosaurus1.gif laelaps.files.wordpress.com/2007/06/edaphosaurus2.jpg Diapsids- two sets of holes in skull, give rise to “reptiles” www.skullsunlimited.com/graphics/Tuatara-Skull.jpg...
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