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| Order Petromyzontiformes; one family Petromyzontidae |
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| single nostril, has dead end |
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| larval ammocoete; adult (parasitic, nonparasitic) |
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| filter feeder, buried in mud; strongly resembles chordate ancestors; long stage, up to 6 yrs |
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| migratory and predaceous; oral disc w/ horny teeth on disk and tongue; parasitic on other fish:rasp holes and suck out blood; return to streams to spawn; semelparous |
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| nonmigratory and nonpredaceous; american brook lamprey; repeated evolution of this form from parasitic parent species; lengthening of larval phase and shortening of mature phase |
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