Key: Step 848. Orthocladiinae 259 Stackelbergina

848a. Lateral setae of segments III-VI branched to form short tufts. Tergites IV-VI with median points enlarged to produce conspicuous nearly circular patches. (Exuvial length 3.5-3.8mm. Thoracic horn elongate, small toothed, 318-362µm long. Pedes spurii B II small. Anal lobes with apical teeth.)

Stackelbergina praeclara

848b. Lateral setae of segments III-VI not tufted, though they may be forked, in which case tergites without obvious median circular point patches.

Step 849. Orthocladiinae 260
Decision path