Otothyropsis

1. Caudal fin with dark-brown spots, sometimes forming irregular transverse stripes; ventral caudal-fin lobe without a light-beige irregular blotch......................... O. marapoama

1’. Caudal fin without dark-brown spots; ventral caudalfin lobe dark-brown, with a light-beige irregular blotch.... ............................................................................ O. polyodon