Fish 1 Flashcards
1
Q
What are agnathans?
A
The first true fish which are jawless e.g. Hagfish and lampreys.
2
Q
Describe the characteristics of the Chordate phylum.
A
- notochord
- brain
- dorsal nerve cord
- pharyngeal slits
- endostyle
- muscular postanal tail
3
Q
Define paedmorphosis.
A
Sexual maturation in juvenile form.
4
Q
What is the feeding behaviour of hagfish?
A
Feed on dead marine animals and tie themselves in knots to increase grip.
5
Q
Give examples of lamprey features.
A
- Single basal opening
- Rudimental thyroid gland
- Has a kidney
- Can osmoregulate in freshwater
- 7 pairs of Gill pouches
- Large well developed eyes.
