Bio 204 Berta slides 10-14
1. 3 types of amniota?: Anapsid - no windows; early amniotes, turtles
- Diapsid - two windows; lizards, crocs, dinos
- Synapsid - one window; mammals
2. How l0ng ago did synapsida occur?: 380 milion years ago
3. what was the stature in begining of synapsida: sprawling stature at first not erect
4. How long ago did Therapsida come about?: 220 million years ago
5. what was the stance on Therapsida ?: mi-erect stance, maybe had tactile hairs (vibrissae)?
6. EArly mamalia occured how long ago?: 167 million years ago
7. what were the earliest mammals like?: small and nocturnal
8. How many species of Mammalia ?: 5,400 living species
40% are rodents
9. is hair homologous to scales in mammalia ?: NO , different origin . likely evolved for sensory
structures then later for insulation
1. 3 types of amniota?: Anapsid - no windows; early amniotes, turtles
- Diapsid - two windows; lizards, crocs, dinos
- Synapsid - one window; mammals
2. How l0ng ago did synapsida occur?: 380 milion years ago
3. what was the stature in begining of synapsida: sprawling stature at first not erect
4. How long ago did Therapsida come about?: 220 million years ago
5. what was the stance on Therapsida ?: mi-erect stance, maybe had tactile hairs (vibrissae)?
6. EArly mamalia occured how long ago?: 167 million years ago
7. what were the earliest mammals like?: small and nocturnal
8. How many species of Mammalia ?: 5,400 living species
40% are rodents
9. is hair homologous to scales in mammalia ?: NO , different origin . likely evolved for sensory
structures then later for insulation
