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Unformatted text preview: they can fill with gas for buoyancy 3) Sarcopterygii lung fishes, lobe-finned fishes, fleshy fins (bony); gave rise to 2 groups: 1) Diphoi lung fish; evolved into the amphibians (more closely related to us 2) Actinistin lobe-finned fish (coelacanth) Bony skeleton (NOT CARTILEDGE) most more resistant to damage (can protect the head area) Bony dermal scales provides protection Operculum external gill slits: operculum is a bony flap that protects the gills, it is also flapped by muscles to move water through gills Heart 2 chambers Reproduction external fertilization, oviparous (egg-layer)...
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- Spring '08