Study Unit 8

Question 1

Sarcopterygii

Answer 1

7-8 species (African lung fish, coelacanth)
Caudal fin (primitive)
Scales large
Paired fins
Massive jaws

Question 2

Actinopterygii

Answer 2

Most diverse in mid Devonian
Heterocercal (asymmetrical tail = faster vs homocercal)
Small fewer scales = faster
Gave rise to Neopterygii —> more specialized locomotion and feeding

Question 3

Neopterygii

Answer 3

Teleost fishes
Symmetrical = better movement
Fewer bones = flexibility
Swim bladder - gas chamber allowing floating
Use of paired fins used for 
-gathering food
-courtship
-walking
-sound production
-fly in water