Figure 2.

Numbers of manual and pedal digits lost in all inferred reductions from a pentadactyl or tetradactyl condition. Each point represents the number of manual or pedal digits initially lost by an inferred pentadactyl or tetradactyl ancestor; subsequent reductions (e.g., from a tridactyl condition produced as a consequence of the initial reduction) are not presented. 'Total number of digits lost' is the number of manual and pedal digits lost in an inferred reduction. Note the overlapping symbols at (2, 1) and (4, 2).