“…The authors posit that in lepidopterans, chromosomal divergence may involve two phases: first, a transient origin through local adaptation, and second, a stable persistence through differential introgression, and a similar scenario may well play out in other groups as well (Conflitti et al, 2015). In addition to paracentric inversions, high rates of other chromosomal rearrangements such as pericentric inversions, reciprocal translocations, fusions and polyploidization appear to be evolving at high rates in several groups of 'notorious speciators' such as Mimulus (Fishman et al, 2013), fish (Cioffi et al, 2015) and butterflies (Sichova et al, 2015;Arias, Van Belleghem & McMillan, 2016). Remarkably, in a recent comparative study, the number of fixed inversions between closely related species of songbirds was most strongly predicted by whether or not the species overlap in their geographical range (Hooper & Price, 2017).…”