Description To 3' (91 cm); 7 lbs (3.2 kg). Elongate, bony plates sharply keeled; olive to yellowish-brown above, sides lighter, white below. Bony head plates with short spines at tip of snout and anterior to eye; snout-shovel-shaped; bases of 4 barbels in straight line; lower lip with 4 papillose lobes; no spiracles. 5 rows of bony plates: 14-19 dorsal plates, 38-47 lateral, 10-14 ventrolateral. Caudal peduncle long, depressed, fully armored; tail heterocercal, upper lobe with long, threadlike filament.