Key: Step 842. Orthocladiinae 253 Orthocladius

842a. Thoracic horn absent. Anal lobes narrowed to tips which are often inturned; with 2 macrosetae.

Orthocladius abiskoensis

842b. Thoracic horn present. Anal lobes without macrosetae.

Step 843. Orthocladiinae 254 Orthocladius
Decision path