The Aulopidae are a small family of aulopiform ray-finned fish. They are found in most tropical and subtropical oceans, and are commonly known as flagfins. The aulopids resemble lizardfishes in appearance, and range up to 60 cm in length. They have large dorsal fins, the first ray of which is greatly extended. They are bottom-dwelling fish, living at depths of 1000 m. The earliest known member of the group is Nematonotus from the Cenomanian of Lebanon.