Date of Origin
Some researchers theorize that butterflies most likely originated in the Cretaceous period when the continents were arrayed differently from their present positions and with climates unlike those of today. That is when the major angiosperm radiation took place. Thus, butterfly evolution must be studied throughout the elaboration and testing of phylogenetic hypotheses and through historical zoogeography. Researchers who accept a Cretaceous origin for the butterflies generally favor vicariant zoogeographic hypothesis for how the major lineages of butterflies came to be distributed over the world, whereas those who favor a Tertiary age rely on dispersalist hypotheses (Lamas, 2008).
Read more about this topic: Butterfly Evolution
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