Lecture 5+6 Flashcards Preview

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Flashcards in Lecture 5+6 Deck (5)
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1
Q

What are key things to note about the lamprey skeleton?

A

1) The skeleton is situated mostly in the head and along the trunk region
2) There is a branchial basket
3) Skeleton consists of slender cartilaginous elements
4) There are slender rays in the caudal fin
5) Slightly elaborate braincase

2
Q

What are anaspids?

A

An early branch of the cyclostome stem

  • no paired find
  • single and anal fin
  • hypocercal tail
3
Q

What are cyclostomes and gnathostomes?

A

Cyclostomes = hagfish and lampreys

Gnathostomes = jawed vertebrates

4
Q

What are characteristics of Thelodonti?

A
  • densely picked scales
  • flattened bodies
  • sturdy hypocercal tails

Or

  • compressed bodies
  • short broad tails
  • paired pectoral fins
  • a dorsal and anal fin
5
Q

Name Gnathostome stem-groups

A
  • Osteostraci
  • Galeaspida
  • Pteraspidomorphi
  • Thelodonti