Mammals Part I Flashcards Preview

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Flashcards in Mammals Part I Deck (45)
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1

How many species of mammals are there?

5000 species

2

what the 3 unique features of mammals?

1. hair: insulation, camouflage, sensory and defence

3

what the 3 unique features of mammals?

2. sweat glands

4

what the 3 unique features of mammals?

3. mammary glands

5

skull types of amniotes: anapsids

turtles

6

skull types of amniotes: synapsids

terapsids and mammals

7

skull types of amniotes: euryapsids

extinct marine reptiles

8

skull types of amniotes: diapsids

dinosaurs and birds

9

what is the key difference between skull size presence, size and number of temporal fenestrae:

holes that provide more surface area for muscle attachment

10

when did true mammals evolve?

around 225 mya - Triassic

11

Different morphological states of middle ear of mammals: MME

mandibular middle ear

12

Different morphological states of middle ear of mammals: TMME

transitional mandibular middle ear

13

Different morphological states of middle ear of mammals: DMME

definite mammalian middle ear

14

what did the development of the middle ear allow?

mammals to hear at higher frequencies than reptiles

15

mammals did not radiate until the extinction of??

dinosaurs

16

the ambulocetus is the ancestor to

whales

17

megatherium were

herbivourous and elephant sized
- giant ground sloth

18

how did smilodons go extinct?

hunting of humans

19

features of mammalia

endothermic

20

features of mammalia

advanced nervous system

21

features of mammalia

internal fertilization

22

features of mammalia

unlike reptiles and fish, mammals also show heterodonty

23

heterodonty

different teeth specilized for tasks

24

features of mammalia

specilization in teeth among species = varied diets

25

features of mammalia

4 chambered heart

26

Prototherians

- monotremes
- egg laying
- egg incubation until hatching
- have mammary glands
- playtpus, echidna

27

marsupials

-pouched
-early birth, fetus completes development in pouch

28

Eutherians

-placental
-embryo retained in female reproductive tract

29

where did platypus (PERRY THE PLATYPUS) originate from?

eastern australia

30

what do platypus use their bill for?

use bill to dig for custaceans and worms