Wikipedia
Chondrenchelys
Chondrenchelys is an extinct genus of cartilaginous fish. Chondrenchelys would have been quite a relatively medium sized fish with an elongated body up to 1 m (3.3 ft) in length, it had a dorsal fin which was indeed long and a body which tapered to a point. Chondrenchelys had two large pairs of tooth plates in each jaw.