Chapter 24: Fishes, Osteichthyes, Class: Actinopterygii Flashcards Preview

Zoology > Chapter 24: Fishes, Osteichthyes, Class: Actinopterygii > Flashcards

Flashcards in Chapter 24: Fishes, Osteichthyes, Class: Actinopterygii Deck (8)
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1
Q

What are these fishes called?

A

Ray finned fishes

2
Q

Teleosts?
constitute 96% of all living fishes and half of all vertebrates. List some characteristics about the habitats they exist in (4)

A
  • survive in 8,000 meters below the ocean surface
  • they can survive in temperatures from 44 degrees Celsius(in hot springs) to -2 degrees Celsius (under Antarctic ice)
  • some live in salt concentrations that are 3 times that of seawater
  • others can be found in swamps devoid of oxygen
3
Q

Fishes in this class have heavy dermal armour replaced by what type of scales?

A
  • light, thin, flexible cycloid and ctenoid scales
4
Q

What organisms lost their scales?

A
  • some eels and cat fishes
5
Q

What is the benefit of not having heavy armour?

A
  • increased mobility helping them avoid predators and improved feeding efficiency
6
Q

List the functions of their modified fins!

A
  • braking, streamlining and social communication

- Homocercal tail allowed greater spend and buoyancy

7
Q

Their jaws modified to increase what?

A
  • suctioning and protrusion to secure food
8
Q

What kind of swimming can they do that sharks cannot?

A
  • swim backwards

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