Conspicuous hump in front of first dorsal-fin origin, made by a very long, thin anterosuperior expansion of the supraoccipital spine. Predorsal area without scales. Both caudal fin lobe with a submarginal blackish stripe. Dorsal and anal fins with grey or black distal margins; first dorsal and anal fins with proximal row of spots. Dorsal-fin origin with a blackish, triangular blotch. A black stripe between the head and the predorsal blotch (Ref. 49523).