Group: Cyclostomes Flashcards
1
Q
Define Cyclostomes
A
jawless fish
2
Q
What do Cyclostomes lack? (4)
A
- jaws
- internal ossification
- scales
- paired fins
3
Q
What are jawless fish’ gill openings like? What are they called?
A
- pore-like
- brancheophores
4
Q
What are jawless fish bodies like?
A
- eel like
5
Q
How many nostrils do jawless fish have?
A
1
6
Q
What do hagfish lack
A
vertebrae
7
Q
are hagfish marine or freshwater?
A
marine
8
Q
when do hagfish regulate matter?
A
when environment salinity changes
9
Q
Can hagfish osmoregulate?
A
no, they just take in water
10
Q
If hagfish are not osmoregulators, what are they?
A
osmoconformers
11
Q
What kind of vertebrae do lamprey have?
A
rudimentary
12
Q
Are lamprey marine or freshwater?
A
freshwater
13
Q
What is the vertebrate hypothesis?
A
- lamprey group with other fish
- hagfish are sister group to vertebrates
14
Q
What is the Cyclostomata hypothesis?
A
- lamprey and hagfish form a clade - cyclostomata
15
Q
What supports vertebrate hypothesis?
A
- most studies based on anatomy/anatomical data
