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| mid-late devonian; radiation late paleozoic, as ostracoderms, placodemrs, adanthodians diminish |
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| w/ lepidotrichia, originate from scales |
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| by internal girdles (contrast sarcopterygians whose fins have bony axis w/ muscle inside fin) |
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| scales coverd w/ it, enamel layer |
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| greater degree of adaptation to complex environments |
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| shorter mouth, many changed related to greater expandability and protrusibility |
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Definition
| elimination of layers, including ganoine, become lighter, more flexible |
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| become more flexible, mobile; developement of homocercal tail |
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Definition
| greater elaboration as buoyancy regulator; frees fins for maneuvers |
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