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Osteichthyes - >27,000 bony fishes, 13,000 herps, 9000 birds, 4800 mammals PowerPoint Presentation
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Osteichthyes - >27,000 bony fishes, 13,000 herps, 9000 birds, 4800 mammals . Bony Fish Characteristics– Endochondral bone. Bony operculum Covering gills. Extinct Antecedents Placoderms (Arthrodires). Neck Joint. Two major branches Of Osteichthyes Sarcopterygia Lung fish Fig 6-3

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Presentation Transcript
slide2

Bony Fish Characteristics–

Endochondral bone

Bony operculum

Covering gills

slide3

Extinct Antecedents

Placoderms (Arthrodires)

Neck Joint

slide5

Two major branches

  • Of Osteichthyes
  • Sarcopterygia
  • Lung fish Fig 6-3
  • Coelocanths Fig 6-4
  • Tetrapods
  • Actinopterygia
  • Ray-finned fishes
slide6

Trends in Actinopterygian Evolution Fig 6-2, 6-8

  • Heavy body armor light overlapping scales
  • Ganoid scales cycloid, ctenoid

Ctenoid

slide7

2) Heterocercal Homocercal tail

Heterocercal tail of Paddlefish

Homocercal tail of swordfish

slide8

Gar

Bowfin (Amia)

slide11

Are mammals on this cladogram? If so where?

  • What is the major difference between ostracoderms and placoderms?
  • For actinopterygians, what is the ancestral condition in terms of scale type and tail type?
  • Sharks maintain neutral buoyancy without a swim bladder. How?
  • What would you predict about the organs for maintaining neutral buoyancy in bottom-dwelling rays and actinopterygians?
  • If a physoclistous fish were swimming to deeper depths, what would the ovale of the swim bladder be doing?
slide14

Evolution of protrusible jaws and pharyngeal jaws

Scissors = gar

Maxilla rotates out – trout

Premaxilla slides out

Protrusible tube

Advantage??

slide16

Pharyngeal Jaws

Advantage??

slide17

Reproduction – most actinopterygians oviparous

Marine- planktonic

Freshwater & nest–guarding Marine

- demersal

slide18

Planktonic larvae

of marine fish

Note adaptations

to blend in with plankton

Or to avoid predation

slide20

Swimming and Actinopterygian fish

“The gap between the swimming fish and the scientist is closing,

but the fish is still well ahead”

Lindsey 1978

slide23

Fig 6-16

High

inertial drag

High

Viscous drag

slide24

Burst Speed

Sustained Speed

Pike

slide25

Lobe Finned fishes - Sarcopterygia

Actinopterygia

Lungfish

Coelocanth

slide26

Aestivating African lungfish

Australia

Africa

S. America

slide27

Sketch sent to JLB Smith

Marjorie Courtney-Latimer

With the mounted S Africa

specimen

Oops! No internal organs or

skeleton!

1938

slide28

“I need a government plane!”

JLB Smith and flight crew

with 2nd coelocanth

Smith sleeps with his prize

slide30

1997 - it happens again!

on a honeymoon trip to Indonesia!

See what paying

attention in

Vert Bio can do?