Mammals 1 Flashcards
1
Q
What are the differences between anapsids, synapsids and diapsids?
A
•Anapsids have no temporal opening in their skulls
•Synapsids have a lateral temporal opening
•Diapsids have a dorsal and lateral temporal opening.
(These are all types of amniotes)
2
Q
What are the three major clades of extant mammals?
A
- monotremes
- marsupials
- eutherians.
3
Q
Define monotremes and give examples.
A
Egg-laying mammals e.g. Duck-billed platypus.
4
Q
Define marsupials and give examples.
A
Pouched mammals e.g. Koalas, kangaroos and wallabies.
5
Q
Define eutherians and give examples.
A
Placental mammals e.g. Humans, dogs and Dolphins.
6
Q
Define adaptive radiation.
A
An increase in species from a single stem group.
7
Q
Give features of mammal.
A
- endotherms
- have vertebrae
- 4 chambered hearts
- skin covered in hair/fur
- mothers produce milk
- young born alive
- up to 4 teeth types
- large brain
- sweat glands.
8
Q
When did the first true mammals arise?
A
Triassic.
