early amphibians

Question 1

Two distinct lineages

Answer 1

• Batrachomorpha
		○ Stem amphibians 
		○ Derived fishapod 1 
		○ Have lots of fish like features
	• Reptiliomorpha 
		○ Stem amniotes 
		○ Derived fishapod 2 
		○ A bit more advanced than batrachomorpha

Question 2

describe •

• Batrachomorpha - temnospondyls

Answer 2

• Gave rise to modern lissamphibians
  
  • Largest and longest lasting group
  • Large, stocky semi-aquatic predators
  • Short lateral legs, 4 fingers on forefoot
  • Flat, non-kinetic skulls - head bears eyes on dorsal lateral portion, jaw can open wide for food but not dislocate/ “crazy wide”
  • Capable of switching between land and water
  • e.g. eryops, cacops

Question 3

skeleton?

Answer 3

• Femur, girdle - lift organism off the ground, help combat gravity
• No tail fin!! Vertebrae column extends
• Skulls well adapted for them to serve as predators
Derived fishapod #1

Question 4

describe reptiliomorphs

Answer 4

• More terrestrial
  
  • Diverse group
  • kinetic ability!!! (first group to have this) - can dislocate jaw to feed on organisms larger than them
  • Five fingered hand
  • Gave rise to amniotes - emergence of an extra membrane for the egg began here!!
  • Moist body -> dryer body in reptiliomorphs

Question 5

early lineages of amphibians

Answer 5

Temnospondyls and Anthracosaurs