| 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 family Latimeridae, Latimeridae - extinct except for the coelacanth class - (biology) a taxonomic group containing one or more orders |