Morpho helenor violaceus
 
Morpho helenor, the Helenor blue morpho or common blue morpho, is a Neotropical butterfly found throughout Latin America, including Panama, El Salvador, Nicaragua, Costa Rica, Mexico, Suriname, French Guiana, Bolivia, Colombia, Peru, Ecuador, Venezuela, Honduras, Guatemala, Paraguay, Brazil, Argentina, and Trinidad and Tobago. It is a species group that may or may not be several species. Many subspecies have been described. Morpho helenor is found from Obidos, Brazil, to southern Colombia and south into Peru. This is perhaps the most common Morpho in South America. It can be recognized by the narrow light blue band across the wings. This is a distinct species from Morpho achilles. The rear wings in Morpho achilles are more angular.