Lecture 34 - Vertebrates II (Mammals) Flashcards Preview

BISC 120 > Lecture 34 - Vertebrates II (Mammals) > Flashcards

Flashcards in Lecture 34 - Vertebrates II (Mammals) Deck (32):
1

4 Derived Characteristics of Mammals

1. Differentiated teeth
2. Hair
3. Mammary glands
4. Proportionately large brain

2

What are the 3 living lineages of mammals?

1. Marsupials
2. Monotremes
3. Eutherians

3

Marsupials definition (EX:)

-embryo develops within placenta of mother’s uterus
-completed development in mother’s pouch (EX: kangaroo)

4

Monotremes definition (EX)

-egg-laying mammals (EX: platypus)

5

Eutherians definition (EX)

-most diverse mammalian group
-young complete development in uterus + born more developed
-EX: bats, carnivores, rodents etc.

6

what are 3 basic eutherian characteristics?

1. Known as placenta mammals
2. Complete embryonic development in uterus, joined to mother more complex placenta with much more developed young at birth
3. 65 million year ancestor rodent-like animal

7

Chiroptera

bats

8

Chiroptera (defining characteristic)

only mammals that have evolved true flight

9

Chiroptera (nutrition)

diverse ecology: feed on insect, nectar, fruit etc.

10

What caused Ebola?

"Bushmeat"

11

Sirenia

manatees and dugongs

12

Sirenia (defining characteristic)

Only herbivore marine animals

13

Which species of Sirenia is extinct?

steller's sea cow

14

Sirenia (3 characteristics)

-4 species
-live in tropic areas
-all threatened/endangered

15

Cetacea

whales/dolphins

16

Odontoceti

toothed whales (orcas, dolphins)

17

Mysticeti

baleen whales (largest animals that have ever lived)

18

Cetacea (nutrition)

carnivores

19

Which Cetacea is extinct?

Yangtze river dolphin functionally extinct since 1990s

20

3 characteristics of Cetacea

1. Ancestors of modern whales were land mammals
2. Common ancestor with hippos
3. Many at risk or recovering species

21

What is a common California whale?

grey whale

22

Perissodactyla

(zebras, mules, horses etc)

23

2 characteristics of Perissodactyla

1. Odd-toed herbivores
2. Rhinos going extinct due to habitat exploitation + poaching
-Javan rhinos extinct in Vietnam

24

Artiodactyla

hoofed animals EX: sheep, giraffes, antelope, pigs, deer, cattle etc.

25

2 characteristics of Artiodactyla

1. Even-toed ungulates (carry weight on 3rd and 4th toe)
2. Herbivorous economically important

26

Rodentia

rodents

27

2 characteristics of Rodentia

1. Incisors that grow constantly
2. Make up ½ of mammal species

28

Carnivora

dogs, cats, bears, weasels

29

3 characteristics of Carnivora

1. Carnivores
2. 280 species with many in decline
3. bag cats decreasing very quickly

30

Provosia

elephants

31

2 characteristics of Provosia

1. extinct in 12 years due to ivory trade
2. African and Asian elephants are sole survivors of a once diverse group

32

We are currently living through the ___________ event in Earth's history

6th mass extinction