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4 Landlife: The vertebrate story
So salamanders have a tympanum?
No
4 Landlife: The vertebrate story
Does a frog have a tympanum?
Yes
4 Landlife: The vertebrate story
How many middle ear bones do reptiles have?
1
4 Landlife: The vertebrate story
Which two evolutionary trends characterise gnathostomes?
4 Landlife: The vertebrate story
Where and how did the first tetrapods live?
They lived mostly in water but could use their limbs to navigate the shallow fresh water where they lived
4 Landlife: The vertebrate story
What is the chiridium by which tetrapods are characterised?
A muscular limb with well defined joints and digits
4 Landlife: The vertebrate story
All modern fish except the cyclostomes belong to:
Chondrichthyes or osteichtyes
4 Landlife: The vertebrate story
Homology:
Common ancestry
4 Landlife: The vertebrate story
What are labyrinthodonts?
Fossil amphibia, the first ones to make the transition to land
4 Landlife: The vertebrate story
Analogy:
Functional convergence
4 Landlife: The vertebrate story
What were the earliest fishes?
Ostracoderms
4 Landlife: The vertebrate story
In many later fish groups there was a tendency for ossification to extend to the internal skeleton but what happened to bone in chondrichthyans, acipenseri and lungfish?
Bone was secondarily lost or reduced
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