16: Fish

Question 1

Are “fish” a monophyletic or paraphyletic group?

Answer 1

Paraphyletic

Question 2

Name 4 key features of Chordates

Answer 2

Dorsal supporting rod (notochord)
Pharyngeal slits between throat and outside world
A dorsal hollow nerve cord
A tail that extends beyond the anus

Question 3

Put the six groups of fish named on (the slide) into order from most primitive to least primitive

Answer 3

Hagfish -> Lamprey -> Cartilagenous Fish -> Ray-finned Fish -> Coelocanth -> Lungfish

Question 4

Are land tetrapods monophyletic or paraphyletic?

Answer 4

Monophyletic - a single common ancestor moved onto land hundreds of millions of years ago

Question 5

What is the clade of land vertebrates that is separate from amphibians? (And what feature does this clade have?)

Answer 5

Amniotes (amniote egg)