Acestrorhynchus maculipinna  Acestrorhynchus maculipinna is a species of fish in the family Acestrorhynchidae. It was described by Naércio Aquino de Menezes and Jacques Géry in 1983. It inhabits the Amazon River. It reaches a maximum standard length of . "A. maculipinna" is currently ranked as Least Concern by the IUCN redlist, owing to postulation that the species is not at great risk of being threatened, due to a lack of fishing in large areas of its region, and the apparent robust health of its environment.