Papillae - Horizontal row b has an elongate anterior extension well in front of the eye; row d is complete, not divided into two sections, and row ot extends ventrally onto the branchiostegals, ending just past the second branchiostegal ray. The first vertical papillae row is complete, extending from the eye to near row d. Additional vertical rows are divided by row b, with two rows above and four rows below row b. Only the last vertical row below row b extends below the level of row d. Dorsal rows X1 and X2 are continuous, or nearly so, as is row n.
Color - The general body color is whitish with a light pink overtone in live specimens. The upper body has numerous densely packed melanophores, the pigment becoming less dense ventrally and ending at the lateral midline. The belly is whitish from the ventral surface to the lateral midline. The head and upper lip have densely packed small melanophores dorsally that become less concentrated ventrally and terminate at the ventral midline. The pectoral, pelvic, and anal fins are transparent. The caudal fin is black except for the midbasal area, which is whitish with a few scattered melanophores. The dorsal fins have scattered melanophores restricted to the membranes between the fin elements that become more concentrated towards the margin of the fin. Neither males nor females possess any genital pigmentation.
Distribution - Eastern Pacific, El Salvador to Peru
Habitat - Black mud