Chordata 2 + 3 Flashcards
1
Q
Sarcopterygii
A
- Defining characteristics
- Three lineages - Lungfish,Coelacanths, and tetrapods
2
Q
Actinistia
A
- Coelacanths
3
Q
Dipnoi
A
- Two lungs and no swim bladder
4
Q
Adaptations to challenges from living on land ?
A
-Support - Stronger skeletal support
- Locomotion - Legs, can’t swim on land
- Fertilization - internal to prevent eggs from drying out in air
5
Q
Tetrapoda
A
- What is a way to deal with support issues while on land - Modifying fins and supporting girdles
- Axial skeleton - Skull and backbone
- Appendicular skeleton -Bones of the limbs and their girdles
- Homology - Shared ancestry between structures even of function is different
- Antagonistic pairs of muscles - Opposite actions to aid on movement
- Four limbs
- Five fingers and five toads
6
Q
Ectothermic
A
Body temperature dependent on ambient conditions
- Uses less energy
- Relies on the environment to create its heat
7
Q
Endothermic
A
Metabolically regulate body temperature
- Can move whenever needed
- Requires more energy
8
Q
Amphibia
A
- Start life as aquatic larvae
- Ectothermic
- Respire through lungs/gills
- Complete metamorphosis
9
Q
Anura
A
- No tail
10
Q
Urodela
A
- Costal grooves
- Toes without claws
- Longitudinal cloacal slit
11
Q
Amniota
A
- Amniotic eggs
- Internal fertilization
- skin is dry and may be covered in scales
- Shells is impermeable to water but allows for gas exchange and waste removal
- Classified based on number of holes in skull
12
Q
Synapsids, Anapsids, and Diapsids
A
- Anapsid - No temporal fenestrae
- Synapsids - Have one temporal fenestrae
- Diapsids - Have two temporal fenestrae
13
Q
Reptilia
A
Diapsid
14
Q
Lepidosauria
A
- Transverse cloacal slit
15
Q
Archosauria
A
- 4 chambered heart
- Diapsid
- Reproduction : Oviparous
