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Lecture 10 wrld dnsr
Origin of Dinosaurs
Question | Answer |
---|---|
No holes in skull: turtles, amphibians, and fish | Anapsid |
Only lower opening in skull: mammals and their relatives | Synapsid |
Two holes in skull: most reptiles, dinosaurs, pterosaurs, and birds | diapsids |
When period did insects appear? | Triassic |
A synonym for a four-legged creature | tetrapod |
What living forms evolved by the end of the Triassic? | Frogs, salamanders, turtles, lizards, snakes, crocodiles, mammals, and DINOSAURS |
With all of these evolutions, what was the Triassic witnessing? | "Dawn of Modern Ecosystems" |
Important group of large herbivores during the Triassic period. They were slow-moving, bulky, and closely related to mammals. | dicynodonts |
What is the group that all dinosaurs belong to? | Archosauria, meaning 'ruling reptile' |
What living forms are current today that belong in the archosaur group? | crocs, alligators, and birds |
In archosaurs, what group includes crocodylians, including herbivores and carnivores, as well as aquatic and land-living forms. | Crurotarsi |
name three crocodylian ancestors. | aetosaurs, postosuches, and terrestrisuchus |
In archosaurs, what other group includes birds, dinosaurs, and pterosaurs? | ornithodira |
One of the richest deposit of Dinosaur fossils during the Late Triassic and where is it? | Ischigualasto Formation, Argentina |
What are some theropods produced by the Ischigualasto Formation? | Eoraptor, Herrerasaurus, Eodromaeus (No larger than a dog) |
Sauropodomorph in this formation? | Panphagia |
Herbivore in the formation? | Pisanosaurus |
What are some characteristics of the first dinosaurs? | upright posture, open hip socket, opposable thumb, and a three-fingered hand |
When a species has an edge over another | Competition |
What gave dinosaurs the edge over other animals living in the Late Triassic? | Upright posture, bipedalism (2-legged), speed, intelligence, and maybe warm blood |