Megalamphodus epicharis

Megalamphodus epicharis has a fusiform body, and the maximum standard length of 3.5 cm (1.4 in). The body is transparent but tinted with red in some places. There is a black humeral spot, the caudal fin is reddish orange, and the dorsal fin is black and white, and there are 8 or 9 soft rays in the dorsal fin and between 23 and 29 soft rays in the anal fin. Males develop longer dorsal and anal fins than females, and they are also slimmer and brighter in color.

Megalamphodus epicharis is only known to occur in the upper basin of the Rio Negro in Brazil, Colombia and Venezuela in blackwater tributaries.

The generic name Megalamphodus is taken from Greek and means "with spacious ways". Carl H. Eigenmann, who erected the genus in 1915, did not explain the allusion, and it is surmised that this name refers to the "very large" fontanels, where the frontal fontanel is "entirely separate" from the posterior one (i.e. there is a space between the frontal bones and the parietal bones). The specific name, epicharis, means "pleasing", "agreeable" or "charming", a reference to the aesthetically pleasing color and form of this fish.