BSC 1005 UNIT 4 STUDY GUIDE DINOSAUR LECTURES Terms to know Paleontologist Someone who studies ancient organisms Paleobiology The study of ancient life China was where the first written accounts of Dinosaurs were found They believed their bones were those of dragons The bizarre scrotum like bone that was found was actually the bottom of a thighbone of a theropoda dinosaur Baron George Cuvier brought up the term extinction and said that there are animals that were alive at one point but have ultimately died off Iguanadons have leaf like teeth similar to that of a modern day iguana Richard Owens recognized ancient remains to be Dinosaur bones Dinosauria Fearfully great reptiles Close relatives to dino s include Pterosaurs and Crocodiles 3 unique dino features 1 Fused hip vertebrae s 2 3 main fingers 3 perdorate acetabulae hole in thigh bone 4 There are 2 kinds of dinosaurs a Ornithiscians b Saurischians Deinonychus means terrible claw and is most like the Velociraptor from Jurassic Park Robert Bakker indicated that Dino s were like birds Dinosaurs lived between 235 million years ago 65 5 million years ago Uranium 235 is what helps determine the age of sediment that contain dinosaur remains Dinonochus the giant croc found in age of dinosaurs Sarcosuchus Super Croc The largest bite force measured from a croc was 3700 pounds Plesiosaurs were NOT dinosaurs They are known as the Loch ness Monster Mammals that lived during the age of dinos were opossums and rats We can tell about a Dino s biology through TRACE FOSSILS tracks a eggs b c stomach stones d coprolites e Dinosaurs DID NOT drag their tails Dinosaur remains are found in sedimentary rocks in the Badlands The first dinosaurs were small creatures Thyrephora Shield Bearers they were armored dinos Stegosaurus was one of the dumbest dinosaurs endocasts view of the brain cavity The crazy theories circulating dinosaurs is due to the many geologists that are in the field You can tell if you have a cerepoda dinosaur because of the gap that is between the front and back teeth Heterodontosaus have different sized teeth may be shown in a picture on exam We can not tell the different sexes among dinos Sexual Dimophism the different sizes and shapes that exist between sexes Dinosaurs are land animals terrestrial Duck billed dinosaurs had Batteries interlocked self sharpening teeth There have been herds of duck bills found including 1 nesting grounds 2 coprolites 3 mummified remains There are 2 types of duck bills a ones with a crest b ones without a crest Horn Dinosaurs have beaks Protoceratops a b thought to have laid eggs that were preyed upon by oviraptor In fact the eggs that were thought to be protoceratops eggs were actually oviraptor eggs Oviraptors showed birdlike behavior when caring for their eggs Big Sauropod dinosaurs had nostrils on the tops o their heads Longest Dino 140ft long Tallest Dino 56ft tall Theropods have hollow bones much like birds Celophysis ate crocodiles Ornithomimids were the fastest dinosaurs Only Theropod that is a plant eater is Segnosaurus Oviraptor have bizarre skull bones Encephalization quotient determines how smart a dino was measuring the size of the brain in comparison to its weight TREX features a did not drag tail b 2 fingers c Bug olfactory bulbs in brain Great sense of smell d Could not run they could amble e Cannibalistic f There is evidence of them being both scavengers and predators Dinos have growth patters most similar to marsupials They went extinct 65 5 million years ago 3 main theories for extinction volcanism lowering seas asteroid that hit the Gulf of Mexico The asteroid theory is most popular Archaepteryx was the first bird it had teeth and a bony tail Birds are Theropod dinosaurs Most paleontologists agree Dinos had feathers and some had gliding powers
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