Homoplasy And Homology In Dinosaurs By Paul Nethercott January 2014

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Presentation transcript:

Homoplasy And Homology In Dinosaurs By Paul Nethercott January

Ichthyosaurs DolphinsDolphins. Ichthyosaurs

AnkylosaursAnkylosaurs and glyptodont mammals both had spiked tails.glyptodont Ankylosauria Glyptodontidae

The sauropods and giraffes independently evolved long necks.sauropodsgiraffes Giraffe Diplodocus

The horned snouts of dinosaurs like Triceratops have also evolved several times in Cenozoic mammals: rhinos, brontotheres, Arsinoitherium, and Uintatherium.TriceratopsCenozoicrhinosbrontotheres ArsinoitheriumUintatherium Triceratops Rhinoceros

The horned snouts of dinosaurs like Triceratops have also evolved several times in Cenozoic mammals: rhinos, brontotheres, Arsinoitherium, and Uintatherium.TriceratopsCenozoicrhinosbrontotheres ArsinoitheriumUintatherium BrontotheresArsinoitherium

The Pelycosauria and the Ctenosauriscidae both had a sail-like fin on their back.PelycosauriaCtenosauriscidae Dimetrodon Ctenosauris

The Pelycosauria and the Ctenosauriscidae both had a sail-like fin on their back.PelycosauriaCtenosauriscidae Dimetrodon Arizonasaurus

Some Placodonts (like Cyamodus, Psephoderma, Henodus and especially Placochelys) bear striking resemblance to sea turtlesPlacodontsCyamodusPsephodermaHenodusPlacochelyssea turtles Cyamodus Placochelys Psephoderma Sea Turtles

Duck-billed dinosaurs hadrosaurs strikingly convergent with ducks and duck-billed platypus.hadrosaursducksplatypus Hadrosaurs Ducks Platypus

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