Key: Step 866. Orthocladiinae 277 Orthocladius

866a. Thoracic horn small, less than 200µm long, tapered to apex, with only a very few minute points near apex (072j.jpg). (Anal lobes without apical teeth.)

Orthocladius trigonolabis

866b. Thoracic horn over 200µm long, more extensively armed with points.

Step 867. Orthocladiinae 278 Orthocladius
Decision path