Scientific articles for Friday oral reports:

1

• Scientific articles for Friday oral reports
• Must be from peer-reviewed journal, not website
• Must get access to entire article, not just
  abstract as
• EITHER A) hard copy, B) HTML download, or C) PDF

2

• Based on the graph, explain how catch continues
  to increase through time
• while per capita catch does not
• What is bycatch?
• What are the ecological effects of overfishing?
• Where does the coelocanth occur?
• Can you drown an Australian lungfish by holding
  its head under water?
• 5. What evolutionary events had already
  occurred by the Devonian
• that were critical for the evolution of the
  tetrapods?

3

• Major evolutionary events in Vertebrate History

• Evolution of jaws and paired appendages

2) The Evolution of Tetrapods and Invasion of
Terrestrial Environments
4
Devonian Age of Fishes- Ostracoderms,
placoderms, acanthodians, chondrichthyes,
actinopterygians, sarcopterygians, first
tetrapods!!
5
Devonian conditions Warm shallow seas Land
with primitive plants Land with terrestrial
invertebrates Why important?
6
Lots of aquatic Devonian predators and
competitors So what? Hypotheses about
evolutionary forces driving invasion of the
land include
7
Important fossil forms in the evolution of
vertebrates
Osteolepiforms Panderichthyes sarcopterygian
fish Acanthostega Ichthyostega stem
tetrapods
8
Osteolepiform
Panderichthyes
Fig 9-3
9
Evolution of Tetrapods wonderful example of
transitional forms
Osteolepiform fish
Acanthostega
Ichthyostega
10
Osteolepiform
Acanthostega
Ichthyostega
Fig 9-3 9-7
11
Challenges of Terrestrial Life Respiration via
lungs Obtaining food Support
12
Respiration - Breathing in Lungfish
13
Feeding on Land Catching and swallowing prey
Suction feeding
14
Freeing the forelimb from the head Fig 8-6
15
Muscular tongue - a tetrapod innovation!
16
Moving onto land Im so heavy! Fig 8-3
Vertebrae, limbs, girdles
17
Attaching limb girdles To vertebral column
Muscular attachment Of flat girdle
Bony attachment via sacrum and ilium of pelvis
18
Evolution of the tetrapod limb - Trying to Find
Fingers in Fins Fig 9-5
Osteolepiform
Dipnoan
pinky
thumb
Only tetrapods
19
(No Transcript)
20
Note major shifts in Tetrapods Fig 8-4