Aim Uncovering the effects of Müllerian mimetic interactions on the evolution of species niches and geographic distributions at a continental scale. Location Neotropics and part of Nearctic. Time Period 19th century to present, with most data collected within the last 30 years. Major Taxa Studied Heliconiini (Heliconiinae) and Ithomiini (Danainae) butterfly tribes. Methods We leveraged a dataset of 67,563 geolocalized occurren...

Sympatric speciation was once thought most improbable, but careful study of some systems, particularly the apple maggot ( Rhagoletis pomonella ) and related Rhagoletis species, has led to its reinstatement as a likely mode of speciation in some cases. Different species and host races in this clade of flies often have highly specialized host preference, and along with frequent evolutionary shifts to different fruit species betw...

Hybrids between species are often sterile or inviable. Hybrid unfitness usually evolves first in the heterogametic sex—a pattern known as Haldane's rule. The genetics of Haldane's rule have been extensively studied in species where the male is the heterogametic (XX/XY) sex, but its basis in taxa where the female is heterogametic (ZW/ZZ), such as Lepidoptera and birds, is largely unknown. Here, we analyse a new case of female h...