class chondrichthyes Flashcards
1
Q
common name, examples
A
cartilaginous fish
- sharks, skates, rays etc.
2
Q
skeleton
A
cartilaginous
3
Q
where is cartilage calcified
A
- teeth
- sometimes vertebrae
4
Q
describe sharks body
A
- streamlined: reduces turbulence
5
Q
what do pectoral and pelvic fins do
A
lift in water
6
Q
what do caudal fins do
A
propel forward
7
Q
what does dorsal fin do
A
stabilize
8
Q
assists in buoyancy
A
oily liver
9
Q
how do they feed
A
- replace teeth
- well developed jaw: modified scales
- carnivore
10
Q
describe senses
A
- sharp, colorless vision
- keen smell: electroreceptors on nose detect electromagnetic fiels
- sense organs respond to stimuli
11
Q
what stimuli do they sense
A
- touch
- vibration
- water currents
- sound
- hydrostatic pressure
12
Q
describe reproduction
A
- internal fert
- transfers sperm using claspers on pelvic fins
13
Q
oviparous
A
- eggs hatch outside of mothers body
14
Q
ovoviviparous
A
fertilized egg retained in oviduct
15
Q
viviparous
A
young develops in uterus, nourished by mother before birth
