11-theropods - Megalosaurus Megalosauridae Infraorder...

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460:206 DINOSAURS The Carnivorous Saurischians: The Theropods
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Theropods Meat-eating predators of dino world. Spanned entire duration of dinos (late Triassic to end K). Chicken to T-rex sized Most skeletons incomplete. Name means “Beast foot”
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Order Saurischia Suborder Theropoda Infraorder Ceratosauria Infraorder Carnosauria Infraorder Coelurosauria
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Carnosaurs “meat lizards” Coelurosaurs “hollow tailed lizards” Ceratosaurs “horned lizards”
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The Theropods Late Triassic Period – Cretaceous Period
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The Theropods “beast foot” or “mammal foot”
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Theropod Morphology
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Infraorder Ceratorsauria Four fingers on hand Lightened skulls, “bumps” and “crests”
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Order Saurischia Suborder Theropoda Infraorder Ceratosauria Group Tetanurae Infraorder Carnosauria Infraorder Coelurosauria
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Group Tetanurae- “Fused tail lizard” Three fingers on hand Digits 1-2-3 present Digits 4-5 “lost” on forelimb
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Group Tetanurae “Bird-like” Two Groups- Carnosaurs and Coelurosaurs
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Infraorder Carnosauria Short necks and forelimbs Heavy frame skeletons Allosaurus Allosauridae
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Infraorder Carnosauria Short necks and forelimbs Heavy frame skeletons
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Unformatted text preview: Megalosaurus Megalosauridae Infraorder Carnosauria Neural spines ~ 1.8 m Sail Backs Spinosaurus Infraorder Coelurosauria Ancestors of birds Long slender hand w/ long digist (2 and 3) Infraorder Coelurosauria Arctometatarsalian foot Family Ornithomimosauridae Family Ornithomimosauridae No teeth (horned beaks in skull) Ornithomimosauridae Family Tyrannosauridae Two fingers on hand (digits 1 & 2 only, on forelimb) Family Tyrannosauridae Predator or Scavenger? Large hindlimbs Small eyes Small forelimbs Infraorder Maniraptora?? Family Oviraptoridae Oviraptoridae Similar to Ornithomimosaur. Skull and jaws designed to crush tough food items. Family Troodontidae Dromaeosauridae Running reptile, Swift lizard. Numerous teeth serrated on both edges. Long forelimbs w/ elongated 3 fngered hands. Tail w/ ossified tendons (for swift turning). Theropod Ecology & Behavior DIET Behavior??? Hunting ??? Theropod Ecology & Behavior HUNTING BEHAVIOR Theropod Ecology & Behavior HUNTING BEHAVIOR GROUP HUNTING?...
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11-theropods - Megalosaurus Megalosauridae Infraorder...

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