Chapter 5 Dinos Flashcards
(22 cards)
Second major group of ornithischian cerapodans and their two subgroups
Marginocephalia
Pachycephalossuria bone heads
Ceratopsia horned Dino’s
Distinguishing feature of marginocephalia
Rim of bone protruding from back of skull to shield neck
How come pachycephalosauria are not well known
Solely known from bowling ball like heads resistant to break down
Identifying feature of pachycephalosaurs
Thickened skull bones with knobby protuberances
What did first bones of pachycephalosaurs identify as
How did they figure out it wasn’t
Kneecaps of bigger dinosaurs
Features of crania
They used computer modeling to determine biomechanical performance of domes a process called ?
Finite element modeling
Our results show that the skulls were ?
Not suited to resist loads from the side but nearly ideal for dealing with blows head on
Distinctive feature of ceratopsians
Beak shaped like that of a parrot rostral bone
Psittacosaurs , earliest ?
Parrot lizard
Ceratopsians
Five foot long bipedal quadrupedal
What did psitt’s not have that descendants had
What did they have to mill tough plants
No neck drill no horns not detentions to mince food
Gastroliths
Psitts are very numerous and what has been collected from them
Growth series (specimens representing all ages)
What are the 6.4 inch bristles on pitt’s equivalent to
Feathers and that all dinosaurs may have had some form of feather like structures
What did they find about life cycle of psitts
First growth curve took long time to reach adulthood (10 years)
Growth rates above reptiles and similar to slower growing mammals
Late Cretaceous period ceratopsians called what and earliest ones are
Neoceratopsians
Protoceratopsids
What is the most famous early neoceratopsian
Protoceratops
Ralph Andrews found what? Nearby they found what, what did they find on eggs , name t was given, what were they actually
Protoceratops and eggs
Oviraptors
Egg robber
Egg layers they guessed their eggs a bird like behavior
Famous specimen fighting dinosaurs
Protoceratops and velociraptor two killed each other and fossilized
What is the inspiration for the griffin myth
Ceratopsians
One chamosaur is
Torosaurus
Bull lizard
Largest head of any animal
Pcshyrhinosaur boss was for what
Pushing matches others say it was for display and finally others suggest it was the base for an enormous horn
Largest ceratopsian 30 foot long
When discovered Marsh thought
Triceratops three horned face
Horns were from enormous bison
Strange debate in 1980s and 1990s over ?
A few researches argued that forelimbs were ?
Trackway found that shows that iTHIS IS A GREAT EXAMPLE
Stature of large ceratopsians
Sprawled out like lizard since humerus has huge flanges that suggest something other than upright posture employed
Walked upright
how trace fossils can supersede bones as the better indicators of dinosaur biology
