Lab 7

Question 1

Coprophagous definition

what order has this?

Answer 1

an animal that eats the feces of another animal .

Lagomorpha

Question 2

is lagomorpha digitgrade or plantigrade?

Answer 2

digitigrade front and plantigrade back

Question 3

pikas family

Answer 3

Ochotonidae

Question 4

skull features of ochotonidae

Answer 4

second incisor
parietals lack fenestrae
no supraorbital process

Question 5

difference between rabbits and hares

Answer 5

R - construct elaborate nests
- altricial young

H - do not construct elaborate nests
- precocial young

Question 6

How is the dentition of Rodentia modified for gnawing?

Answer 6

• single pair of upper and lower incisors
• incisors are ever-growing
• large diastema
• lack canines
• incisors with enamel only anteriorly and laterally = creates a chisel

Question 7

What are the 4 types of zygomatic modifications for master muscle attachment?

Answer 7

1. Protrogomorphous
2. Sciuromorphous
3. Myomorphous
4. Hystricomorphous

Question 8

Describe sciuromorphous. example?

Answer 8

medial masseter doesn’t pass through infraorbital canal
efficient at biting

ex. squirrels, chipmunks, marmots

Question 9

Describe myomorphous. example?

Answer 9

medial goes through eye socket
gnawers and chewers, typically seed eaters

ex. mice, gerbils, hamsetes, lemmings, voles

Question 10

Describe hystricomorphous. example?

Answer 10

huge infraorbital former
meidal passes through infraorbital former and connects to rostrum
chewers

ex. porcupines, guinea pigs

Question 11

What adaptations does Castor canadensis have to living in cold water?

Answer 11

large bodied
long guard hairs
webbed hind feet
clawed forefeet

Question 12

Differences between the two pocket gopher species manitoba? what are they?

Answer 12

Thomomys talpoides

• upper incisor not grooved
• grey coloured

Geomys bursarius

• upper incisor grooved
• brown coloured