Description
Hans Fruhstorfer describes: "M. rhetenor, already named by Cramer the 'blue elongate Atlas butterfly', has the apex of the forewing more produced than any other Morphid species; a characteristic, however, that partially disappears in the female, which more resembles that of cypris. The male is one of the most brilliantly glossy species and has only a quite inconsiderable black apical spot and a white costal patch on the forewing. The under surface is noteworthy for the contrast between the black basal area and a brown distal region, which are separated by a median band of a more or less pure white and of varying extent according to the locality. Both wings beneath show brown rounded eye-spots entirely without white pupils."
Sex difference
Morpho rhetenor is sexually dimorphic. The female is bigger than the bright blue male and has a dark-brown upperside with a lighter brown outer edge. There is a central yellow area tapering into a triangle and isolated patches as it crosses the forewings and a separate chain of yellow spots crosses the forewings and hindwings.
Morpho rhetenor es un especie de insectos con 28 observaciones
colombia.inaturalist.org