19a. Caudal seta 2 (the longest) is strongly curved ventrally at the tip. Inner and outer spine on the second segment of leg 5 inserted at tip. Leg 4 coupler with paired protrusions covered with 4-6 spinules on caudal surface.

19b. Caudal seta 2 is relatively straight at the tip. Inner spine on the second segment of leg 5 inserted at the middle of the inner margin. Leg 4 coupler protrusions without ornamentation.

Question 20