Ch. 16: Fishes

Question 1

Class Chondrichthyes

Answer 1

• Sharks & rays
• Cartilaginous fish
• Heterocercal tail
• Single circulation
• Lateral line

Question 2

Bony Fishes

Answer 2

• Homocercal tail
• Cycloid scales
• Swim bladder developed from the gut
• Lateral line
• Metamorphic life cycle

Question 3

2 types of bony fish

Answer 3

1. Ray-finned fish

2. Lobe-finned fish

Question 4

2 challenges for transition to the land

Answer 4

1. Medium density: strong weight support needed

2. Dry and hot

Question 5

2 key solutions to transition to land

Answer 5

1. Add strength to limbs
2. Develop lungs
   These allowed the radiation of tetrapods