Abstract
An apterous Mezirinae, Allelocoris ursulae new species is described from Petrópolis, Brazil. The area where this new species was collected, previously considered a stable biotope favorable for apterous aradid species, has suffered extensive deforestation and repeated mudslides. The species or its local population with unknown, but presumably limited distributional range, may even have become extinct. This concern is supported by the fact that no additional specimens have been collected in more than 125 years.
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