2 - Fishes Flashcards
1
Q
In oceans no light beyond
A
1000 meters
2
Q
Anglerfish adaptations
A
total darkness so:
- release mate attracting pheromones
- glowing bulb used of catching food
3
Q
Desert pupfish
A
can withstand temps up to 45 degrees C
4
Q
Crocodile icefish
A
- blood lacks red blood cells and haemoglobin
- clear blood
- contains anti-freeze chemical that prevents build up of ice crystals
5
Q
When did this adaptive radiation begin
A
500mya
6
Q
Ostracoderms
A
“fish” = oldest craniata
7
Q
Teleostei
A
Most fish on planet now
8
Q
Fish are ancestors of what
A
all other vertebrates
9
Q
Subphylum craniata main characteristic
A
Skull that surrounds 3 part brain
Olfactory organs
Eyes
Inner ear
10
Q
Subphylum craniata 2 infraphyla
A
- hyperotreti (hagfish)
2. vertebrata (vertebrates)
11
Q
Infraphylum hyperotreti (hagfish) characteristics
A
Jawless Skull of cartilage Lack vertebrae and retain notochord No paired appendages Mouth with 4 pairs of tentacles Olfactory sacs open to mouth cavity 5-15 pairs of pharyngeal slits Ventrolated slime glands Tough, leather-like skin
12
Q
Hagfish slime
A
Reacts with water to become slippery
Important for eating dead prey
13
Q
More about hagfish
A
- Marine
- scavengers that feed off dead or dying organisms
- skin is used as leather
- 60 species
14
Q
Superclass petromyzontomorphi class
A
class petromyzontida (lampreys)
15
Q
Lamprey characteristics
A
- sucking mouth with teeth and rasping tongue
- 7 pairs of pharyngeal slits
- blind olfactory sacs
- true vertebrates but have ancient features
- 41 species
- marine and freshwater
- Some parasitic (ex: on lake trout) some not
- Complicated life style
- some are invasive species
