Comparisons between male D. melanogaster

and D. simulans

Pictures of male D. simulans. Note the small orange-red protuberance (arrow) on the

D. simulans genitalia.

Comparison between D. melanogaster (left) and D. simulans. Again, notice the absence of a large genitial arch in D. melanogaster compared to D. simulans.

Drawing of D. simulans (left) and D. melanogaster males (from Ashburner, 1989).