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ResumenSe presenta un estudio filogenético del subgénero Phyllophaga (Triodonyx) basado en 48 taxones de Melolonthinae y 140 caracteres morfológicos externos de adultos y de genitales masculinos y femeninos. Del análisis cladístico se obtuvieron 3 árboles igualmente parsimoniosos que permitieron comprobar la monofilia del grupo y evaluar su posición taxonómica. Los resultados muestran evidencias suficientes para asegurar que las 5 especies, tradicionalmente asignadas al subgénero Triodonyx, no pertenecen al género Phyllophaga. Se propone la restitución del género Triodonyx y la formación de la subtribu nueva Triodonina. Las relaciones del nuevo grupo con otras tribus de Melolonthinae se comentan en forma preliminar.AbstractA phylogenetic study of the subgenus Phyllophaga (Triodonyx) based on external morphology and male and female genitalia characters of adult specimens is presented. The cladistic analysis included 48 taxa of Melolonthinae and 140 morphological characters. Three equally parsimonious trees were obtained. The results allowed to conclude that the 5 species traditionally included in the subgenus Triodonyx do not belong to the genus Phyllophaga. The restitution of the genus Triodonyx and the formation of the subtribe Triodonina are proposed. The relationships of the new group with other tribes of Melolonthinae are preliminarily commented

Análisis filogenético del subgénero Phyllophaga (Triodonyx) (Coleoptera: Melolonthidae: Melolonthinae)