crossopterygian

Etymology
From, Greek krossoí “tassels, fringe” +  + pterýgion “little wing or fin,” equivalent to pteryg- (stem of pterýx ) “wing, fin” + -ion + -an.

Adjective

 * 1)  Of or pertaining to the, an infraclass of bony fish.

Noun

 * 1)  One of the.