| Resumo: | A new species of whitefly, Aleuropleurocelus petenensis sp. nov. Carapia-Ruiz & García-Ochaeta, found on leaves of a plant belonging to the genus Acalypha (Euphorbiaceae) in Petén, Guatemala, is described based on characteristics of the pupa. This new species exhibits a black venter and has microtubercles on the subdorsal and submedian areas, whereas the most closely related species, A. mixtecus Carapia-Ruiz, presents a pale venter and has not microtubercles on the corresponding areas. In both species the transverse suture of the molt ends before the apparent margin and the dorsal surface presents folds; these features support the close relationship between these species. Microphotographs of morphological structures of the new species puparium are provided.
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