Abstract
Although many traits can be gained or lost over evolutionary time, it has long been unclear whether complex sensory processing structures, such as brain neuropils, can be regained after having been lost. Morris etal. show that a part of the brain once lost in butterflies, a macro-glomeruli complex (MGC) in the antennal lobe, is prevalent and has diversified in the Ithomiini tribe. This structure is sexually dimorphic in some species. This re-emergence of a complex sensory processing structure is likely driven by ecological factors.
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