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| extant forms diff from origional members, difficult to identify; cartilaginous skeleton, originally bony |
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| some extant groups known from triassic |
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| family acipenseridae; lots of eggs, anadromous and fw; largest fw fish; 5 rows bony scutes; 4 barbels anterior and inferior; protrusible mouth(no teeth);ampullary(electrical)organ; spiracle;benthic feeder;hard curved spines pectoral fin;long fw migration |
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| lobed pectoral fins;spiracle;ganoid scales;dorsal fin w/ finlets w/ single spine each and 1 or more rays; paired lungs; spiral intestine; heterocercal caudal fin |
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| family polyodontadae; filter feed zooplankton; pisciverous(fish and inverts);fw;paddle snout, ampullary organ; gill rakers long and numerous; tiny teeth; spiracle, no scales; ram ventilation(must swim);pelvic fin/ureogenital opening |
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