Fig. 7.

Tarsal segment schematics describing potential ways to increase space for rotation and avoid obstruction on rotation. Morphological analyses in several Drosophila species suggest that various developmental modifications can potentially increase space available for rotation (red polygons), but only some of them are observed in long D. melanogaster sex combs (gray boxes). Gray circles represent sex comb teeth in the initial position and black circles represent sex comb teeth in the final position. Empty circles represent the TR bristles. Gray arrows indicate movement of individual tooth or sex comb rows. Yellow curved arrow shows displacement of distal TR.