Telchin atymnius futilis

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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.

Castniomera es un género de lepidópteros de la familia Castniidae. Fue descrito por Houlbert en 1918, consta de una sola especie: Castniomera atymnius. ​ Es originaria de Venezuela.