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|Noun||1.||subclass Crossopterygii - fishes having paired fins resembling limbs and regarded as ancestral to amphibians|
class Osteichthyes, Osteichthyes - a class of fish having a skeleton composed of bone in addition to cartilage
crossopterygian, lobefin, lobe-finned fish - any fish of the order Crossopterygii; most known only in fossil form
class - (biology) a taxonomic group containing one or more orders