Whinnett A, Zimmermann M, Willmott K, Herrera N, Mallarino R, Simpson F, Joron M, Lamas G, Mallet J. Strikingly variable divergence times inferred across an Amazonian butterfly ’suture zone’. Proc Biol Sci. 2005;272(1580):2525–33. PMCID: PMC1599783