zoology- agnatha (jawless fish, no paired appendages )

lots of spelling errors LOL but effective studying

Sarcopterygii

1. skeleton ossfiied- celleualr bone w/ mizniserlized desposits
2. operculm covering open gill
3. pair fins withsturdy internal skeelton (pelvic gridle)
4. lung life swim bladder capable of gas
5. dispherceral caudal fin
6. ganoid scales
7. mucles within limbs to supporst weight bearing

sarcoptergyii examples

lungfish- uses swim bladder in dry seasons for gas exchange

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coelclanths- surviving marine relic with true lobe fins

actintopergyii

1. skeleton ossified for the most part
2. single operculm covering gill opening
3. 2 chambered heart
4. paried kindeys; dorsal to body
5. msucles within body to control fins
6. paired fins with muscle rays within fins (modifed scales within the dermis)
7. swim bladder for buoynacy

actintopergyii examples

chondrostei- cartillagnous skeleton, ganoid scales, hetrocercal caudal fin (sturgeon) homocercal caudal fin (paddlefish)

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Neopterygii- skeleton primiarily bone, cyloid or ctneoid sales, homocercal caudal fin ex- modern bony telost, gar, bowfin