subclass Crossopterygii subc·lassc·ros·sopterygii uncommon noun 1. fishes having paired fins resembling limbs and regarded as ancestral to amphibians SynonymsCrossopterygiisubclass Crossopterygii Related words Broader terms class Parts Osteichthyes Part of crossopterygianLatimeridae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
