What is the X in X-mas?
|lobe-finned fish |
Any of various fishes of the class Sarcopterygii, having fins that are rounded and fleshy, suggesting limbs. One group of lobe-finned fish are thought to be ancestors of amphibians and other land-dwelling vertebrate animals. They first appeared in the Ordovician Period and are extinct except for the coelacanth and lungfish. Also called sarcopterygian. Compare ray-finned fish. See also crossopterygian.
any of about 10 species of tropical African fishes of the genus Polypterus. Bichirs and the eellike reedfish, Calamoichthys (sometimes called Erpetoichthys calabaricus), are of the family Polypteridae, order Polypteriformes. Like the sturgeons and paddlefishes, they are thought to be members of the superorder Chondrostei, although some authorities question this.