Posted by Chen Young on 10-11-2006 16:54
#4
to show the rotation of male during mating. Actually some of the small-sized crane flies such as genus Ormosia, and others the males have evolved to the point that the entire ninth sgement of the abdomen has undergone a rotation of approximately 180 degree so the tergal plate lies on the sternal surface of the body. Assumed they are just too small to sustain the rotation as the large sized tipulids can do.