(fish) phylum chordata Flashcards

1
Q

how did non-vertebrate chordates?

A

post-anal tail fin

notochord from tip to tail
- contained elastic collagen rod runs all the way through

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2
Q

how has muscle in the fish changed?

A

went from V-shaped myomeres to W-shaped myomeres

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3
Q

where is the nerve chord in the lancelet?

A

slightly above the head

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4
Q

what fins did early Cambrian chordates have?

A

dorsal and ventral

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5
Q

early fish contained what type of bone?

A

dermal bone- forms in the skin - causing exoskeleton

primitive fish only had cartilaginous endoskeleton

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6
Q

what are the characteristics of jawless fish with dermal bone?

A

dermal bone coverings: carapace or scales

small mouths, jawless

late Devonian extinctions

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7
Q

in early phylum Chordata, where do the jaws start?

A

jaws from the anterior gill arches

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8
Q

which fish had bony exoskeletons?

A

jawless and jawed fish

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9
Q

what are the 2 living jawless orders?

A

hagfish orders

lamprey order

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