Claim: Iniopteryx from the family of Iniopterygidae is an extinct genus of cartilaginous fish, a group of fish where skeletons are largely composed of cartilage.
Evidence: Family: †Iniopterygidae Genus: †Iniopteryx Iniopteryx ("Nape Wing") is an extinct genus of cartilaginous fish. Chondrichthyes (/kɒnˈdrɪkθi.iːz/; from Greek χονδρ- chondr- 'cartilage', ἰχθύς ichthys 'fish') is a class that contains the cartilaginous fishes: they are jawed vertebrates with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.