Lecture 21- Dinosaurs Flashcards
What period did dinosaurs appear?
Triassic period (230 million years ago)
What period did dinosaurs disappear?
Cretaceous period (65 million years ago)
For how many years did dinosaurs roam the earth?
165 million years
Which era is known as the age of the dinosaurs?
Mesozoic era
When did Tyrannosaurus Rex die?
65 million years ago, during the K-T extinction
What was the supercontinent called when they were all stuck together?
Pangea
The largest T-rex ever discovered comes from where? When was it discovered and how much did it weight?
Saskatchewan. Discovered in 1991, weighed 9.8 tons
Why did dinosaurs die out 65 Mya?
K-T (mass) extinction event
What does the K in K-T stand for?
K= Kreide (German for Cretaceous period)
Cretaceous comes from the word? Which means what
CRETACEOUS, which is latin for chalk. Cretaceous period is named after large quantities of chalk, a form of limestone made up of calcite (CaCO3) left behind in Europe
What does the T stand for in K-T
T= Tertiary
When does the K-T event happen in terms of periods?
End of Cretaceous and start of tertiary period.
Birds are dinosaurs which means they are theoretically?
Reptiles
T or F: all avian and non-avian dinosaurs dies out during the K-T event
False, some avian dinosaurs (but no non-avian ones) survived the K-T extinction event
Birds descended from what type of dinosaurs?
Maniraptoran
What is the Maniraptora?
Group/clade of theropod dinosaurs that palaeontologists believe birds were derived from approximately 150 million years ago during the Jurassic Period
What are Theropod dinosaurs?
Dinosaurs with hollow bones and 3 toes/claws on each limb
What is propatagium?
À thin feathered fold of skin on wing that helps organism to obtain lift when flying or gliding
T or F, Maniraportans feature a propatagium
True
What are 3 other survivors of the K-T extinction events?
Alligators, frogs, lizards (reptiles, reptiles and amphibians)
Some mammals also survived the K-T extinction event. What was it called?
The purgatorius, one of the earliest known primates and our earliest ancestors (squirrel looking)
K-T event wiped out what percent of animals caused by asteroid impacts where the impacts ejected debris that blocked sun and changed temp and sea levels?
80%
What is the Bambiraptor
À maniraptoran dinosaur that lived during the Cretaceous period
Primates are mammals that:
Have hands and feet that grasp
Have relatively large and complex brains
Have vision that sees objects in 3 dimension
