 The caudal fin comprises more or less a quarter of the total length, and is low with a small lower lobe and a ventral notch near the tip of the upper lobe.The skin is thick and densely covered by small, overlapping, well-calcified dermal denticles; each denticle has a leaf-shaped crown with a horizontal ridge and three teeth on the posterior margin.There is a prominent, saw-like crest of enlarged denticles along the dorsal margin of the caudal fin.