Chapter 24: Fishes, Class: Myxini aka Hagfishes Flashcards
1
Q
What kind of habitat do they live in?
A
- entirely marine
2
Q
Do they have a jaw or lack one?
A
- jawless
3
Q
In terms of acquiring food what are they classified as?
A
- scavengers and predators of annelids, molluscs, dead or dying fishes etc
4
Q
How do they enter the dead or dying prey?
A
- via an orifice or by digging inside using keratinized plates on tongue.
5
Q
What is their vision like?
A
- nearly blind
L> they locate food by an acute sense of smell and touch
6
Q
How do they obtain leverage when attacking prey?
A
- ties a knot in tail and passes it forward to press against prey
7
Q
They have special glands along the body that do what ?
A
- secrete fluid that becomes slimy in contact with seawater
8
Q
What is the relationship between their internal body fluids and the seawater?
A
- they are in osmotic equilibrium with seawater
9
Q
What is their circulatory system composed of?
A
- three accessory hearts in addition to a heart behind the gills
10
Q
Reproduction. Whats going on with that?
A
- completely UNKOWN whoaaa.
- In some species females outnumber males 100 to 1
11
Q
Females and their eggs, describe them!
A
- they produce small numbers of large yolky eggs
