Relating to or belonging to the fish class Chondropterygii, having a skeleton made of cartilage.
From Greek 'chondros' (cartilage) + 'pterygion' (fin) + '-ous' (having the quality of). This adjectival form describes creatures belonging to the cartilage-skeleton class.
All chondropterygious fish lack the swim bladder that bony fish use to stay buoyant, so sharks must constantly swim or they sink—it's why you never see a resting shark in the ocean (except for a few species that pump water over their gills while stationary).
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