EARTH 7 Lecture Notes - Lecture 11: Therizinosaurus, Carpal Bones, Ulna
Birds are maniraptors
1. Semi-lunate carpal
a. Present
2. Bowed ulna
3. Highly stabilized tail
4. Reversed pubis
Therizinosaurus
- But unlike the rest of large theropods, it was an herbivore
- 40ft head to tail
Oviraptosaurians “egg snatchers”
- Cretaceous of asia and north america
Clearly actually egg incubators not egg thieves
Significance:
- Parental care
- Bird-like brooding behavior
Crocodiles have 2 ovaries → birds have 1
Troodontids and Dromaeosaurids have a large, retractable claw on toe #2
Advanced, asymmetrical feathers?
This shape indicates
- Gliding is a type of flight
- Several groups with such feathers appear to have lost the ability to fly
Advanced feathers in troodontids
- Evidence of a lot of bird-like similarities
Feathers are homologous reptilian scales
- Similar pro
The function of feathers before powered flight
a. Insulation
b. Display
c. Running, jumping, gliding
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