lecture 8

Question 1

Subclass: Chondrostei, Order Acipenseriforms

Answer 1

-sturgeon, paddle fish
-primarily cartilaginous skleteon
-electroreceptors
-long lived and late sexual maturity

Question 2

Subclass: Neopterygii, Order: Lepisosterifomres

Answer 2

-gar
-highly vascularized swim bladder

Question 3

Subclass: Neopterygii, Order: Amiiformes

Answer 3

-bowfins
-highly vascularized swim bladder

Question 4

Polypteriformes

Answer 4

-spiracle lungs to breathe air (facultative air breather)

Question 5

Division: Teleostei (new finned fish)

Answer 5

-uroneurals (made from neural arches fusing)
-mobile premaxilla bone
-reduction of bone mass

Question 6

Subdivision: Osteoglossomorpha

Answer 6

-bony tongues
-well developed teeth on tongue
-

Question 7

Subdivision: elopomorha

Answer 7

-true eels
-defined by having the leptocephalus larval stage

Question 8

Subdivision: Ostarioclupeomorpha

Answer 8

-enhanced hearing via inner ear-swim bladder connection
-physostomes: gulp air at surface
-tubercles: release substance when cut that alerts others that predator is nearby

Question 9

Subdivision: Euteleostei

Answer 9

• superneural bones between head and dorsal fin
  -stegural in caudal fin
  -cartilage between hypurals in caudal fin