Chapter 24: Fishes, Osteichthyes: Bony fishes Flashcards Preview

Zoology > Chapter 24: Fishes, Osteichthyes: Bony fishes > Flashcards

Flashcards in Chapter 24: Fishes, Osteichthyes: Bony fishes Deck (5)
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1
Q

Is this a valid taxon?

A

No it is just term of convenience

2
Q

What were the two lineages that are under this category that developed during the middle of the Devonian?

A
  • Class Actinopterygii- ray finned fishes radiated to form modern bony fishes
  • Class Sacropterygii- lobe finned fishes which include lungfishes and the coelacanth
3
Q

What does the operculum function as?

A
  • increased respiratory efficiency via drawing water across gills
4
Q

What do the gas filled structure off the esophagus function in? What two variations are there?

A
  • helped in buoyancy and also in hypoxic waters
  • Some fishes use these for respiration , they are called lungs in that case
  • those that use it for buoyancy they are called swim bladders
5
Q

Specialization of jaw musculature improved what?

A
  • feeding

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