Castniomera is a monotypic genus of moths in the family Castniidae described by Constant Vincent Houlbert in 1918. Its single species, Castniomera atymnius, commonly known as the giant butterfly-moth, was first described by Johan Wilhelm Dalman in 1824. It is known from Mexico through Central America to Venezuela.
The larvae feed on Musaceae species.
Subspecies The following subspecies are recognised: Castniomera atymnius atymnius (Dalman, 1824) - eastern Brazil, French Guiana, Colombia Castniomera atymnius drucei (Schaus, 1911) - Colombia, Costa Rica Castniomera atymnius ecuadorensis (Houlbert, 1917) - Ecuador Castniomera atymnius futilis (Walker, 1856) - Nicaragua, Mexico, Honduras, Panama Castniomera atymnius humboldti (Boisduval, ) - Colombia Castniomera atymnius immaculata (Lathy, 1922) - French Guiana Castniomera atymnius newmanni (Houlbert, 1917) - Panama to Colombia, Venezuela
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