Charlie Longtine, Chad M Eliason, Darcy Mishkind, ChangHee Lee, Michael Chiappone, Franz Goller, Jay Love, Evan P Kingsley, Julia A Clarke, Clifford J Tabin
The origin of novel traits, those that are not direct modifications of a pre-existing ancestral structure, remains a fundamental problem in evolutionary biology. For example, little is known about the evolutionary and developmental origins of the novel avian vocal organ, the syrinx. Located at the tracheobronchial junction, the syrinx is responsible for avian vocalization, but it is unclear whether avian vocal folds are homologous to the laryngeal vocal folds in other tetrapods or convergently evolved. Here, we identify a core developmental program involved in avian vocal fold formation and infer the morphology of the syrinx of the ancestor of modern birds...
December 29, 2023: Current Biology: CB