Figure 7
From: Vocal specialization through tracheal elongation in an extinct Miocene pheasant from China
Strict consensus of the most parsimonious trees showing the phasianin affinity of Panraogallus hezhengensis. Major clades of galliforms are colored. Tracheal elongation is labeled on terminal branches with dots, and its distribution suggests multiple origins within Galloanserae (closed squares indicate that both sexes have the trait, and open squares designate that only males have the trait).
