EXAM

Question 1

Herrarasaurus

Answer 1

• Among the oldest known dinosaurs
• Not ancestral to any later dinosaur group
  
  • However, textbook says possibly ancestor to saurischians
• Mixture of characteristics
• Triassic period (231 Mya)

Question 2

Order Ornithischia

Answer 2

• Known as Bird-hipped
  
  • But not the ancestral group of birds
• More complex pelvis
  
  • Ischium and pelvic bone parallel
• Had a beak
  
  • Predentary bone
• All Herbivorous
• Bipedal and quadrupedal
• Often in large herds
• Often prey for many saurischian theropods

Question 3

Order Saurischia

Answer 3

• Known as Lizard-hipped
• Has simple three pronged pelvis
  
  • Similar to other non-avian reptiles
  • Ischium pelvic bone sticks out
• Two suborders
  
  • Theropods
  • Sauropod

Question 4

Suborder Theropods

Answer 4

(Order Saurischia)

* Means beast feet
* Contained all carnivorous dinosaurs 
* All bipedal 
* Shortened forelimbs 
* Decants include birds 
* Share similar characteristics with birds:
    * Furcula (Wishbone)
    * Air filled bones (Pneumatized)
    * Brooding of eggs 
    * Feather
* Very intelligent

Question 5

• Subgroup Sauropod

Answer 5

(Order Saurischia)

* All Herbivorous
* All quadrupedal 
* First land vertebrates to eat trees
* Long neck
* Small head (Because of long neck)
* Massive body
* Long tail
* Forelimbs: pillars (slender)
* Hindlimbs: thick, straight and powerful with 5 toes 
* Smallest: 5-6 ft long! 
* Largest: over 100 ft long!