Mammals Flashcards Preview

2nd Year: Animal Biodiversity > Mammals > Flashcards

Flashcards in Mammals Deck (26):
0

What is a fossorial mammal?

A burrowing animal

1

What is a cursorial mammal

A running animal

2

How many species of mammal are there?

4800, mammals are the LEAST diverse clade

3

What is prototheria?

The monotremes

4

What is metatheria?

The marsupials

5

What is eutheria?

The placental mammals

6

What are the 5 unique mammalian characteristics?

1. Hair for endothermy
2. Lactation
3. 3 middle ear bones
4. Significantly enlarged brain
5. Diphyodonty (2 sets of teeth)

7

What is theria?

A clade containing metatheria and eutheria

8

Which group is the only group to have nipples?

Theria (the marsupials and placentals)

9

What do monotremes have instead of nipples?

Mammary hairs

10

What is the mammalian stapes homologous to in reptiles?

The columella in the middle ear

11

What is the mammalian incus homologous to in reptiles?

The quadrate

12

What is the mammalian malleus homologous to in reptiles?

The articular

13

How many species of prototherian are there and what are they?

5:

1 platypus and 4 echidna

14

The prototherians have a single posterior opening, what is it called?

The cloaca

15

What can platypuses sense with their snouts?

Electromagnetic signals

16

How many eggs do prototherians usually lay?

1-3

17

What are the eggs of prototherians like?

Leathery eggs

18

How many species of metatherian are there?

270

19

Why are metatherians born at such a low birth weight?

The young are born as foetuses with overdeveloped forelimbs to crawl to the pouch. There they latch onto a nipple and develop outside the body.

20

What are the didelphimorphia?

The American opossums

21

What are the paucituberculata?

American shrews

22

What are the microbiotheria?

South American monito del monte

23

What are the dasyuromorphia?

Carnivorous Australian marsupials

24

What are the peramelamorphia?

Australian bandicoots and bilbies

25

What are the notoryctemorphia?

Australian me arsupial moles