Chapter 2: Evolution of MM

Question 1

Polar bear derived from

Answer 1

brown bear (1-.5mya)

Question 2

Mustelidae (weasels/otters) derived from

Answer 2

FW otters (1-3mya)

Question 3

Pinnipedia derived from

Answer 3

Ursids (40mya) (monophyletic)

Question 4

Pinnipeds evolved from which extinct group, how long ago?

Answer 4

Pinnipedimorph North Pac

25mya

Question 5

Otariid evolved how long ago?

Answer 5

22 mya

10-12mya North Pac

Question 6

Odobeniid evolved how long ago? How many species were there?

Answer 6

14mya. 20spp, now one.

Question 7

Phocids?

Answer 7

oldest 25mya, most 15mya.

Question 8

Cetacea

Answer 8

50mya. Prob came from Hippos.

Question 9

When did Odontocetes and mysticetes split?

Answer 9

40-35mya

Question 10

Odontoceti? How many super fams?

Answer 10

25mya

5 superfams

Question 11

Mysticeti? How many fams?

How did they change?

Answer 11

35-29mya
4
loss of teeth, large body and head, shortening of intertemporal region and neck.

Question 12

Sirenia:
when?
from whom?
which still exist?

Answer 12

50mya
from elephants
3spp manatees, 1sp dugong