Metynnis lippincottianus

Metynnis lippincottianus, commonly known as the spotted silver dollar, is a species of freshwater ray-finned fishes belonging to the family Serrasalmidae, which includes the pacus, piranhas and related fishes. This fish is found in the Brazilian Amazon and multiple rivers of French Guiana. An average M. lippincottianus can grow to a length of 13 cm.
The fish is named in honor of Cope's friend, James S. Lippincott, who made contributions to Meteorology, Agriculture and other studies.