Abstract
Adult and immature stages of Atacamaptilia ambrosiavora Vargas Espinoza-Donoso gen. et sp. nov. (Lepidoptera: Gracillariidae: Acrocercopinae) from the Atacama Desert of northern Chile are described and illustrated. The Neotropical Atacamaptilia Vargas Espinoza-Donoso gen. nov. resembles the Old World genera Melanocercops Kumata Kuroko, 1988 and Phodoryctis Kumata Kuroko, 1988 in wing venation. However, differences in genitalia morphology enable the recognition of Atacamaptilia Vargas Espinoza-Donoso gen. nov. as a different genus. COI sequences support this delimitation, since it is not closely phylogenetically related to these genera. A divergence of 18% (Kimura 2-parameter model) of A. ambrosiavora Vargas Espinoza-Donoso gen. et sp. nov. to its nearest neighbor Leucospilapteryx omissella (Stainton, 1848) was found. The larvae of A. ambrosiavora Vargas Espinoza-Donoso gen. et sp. nov. mine leaves of Ambrosia cumanensis Kunth (Asteraceae).
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