Key: Step 684. Orthocladiinae 96 Psectrocladius

684a. Populations with an average of 25 taeniae or less on each anal lobe. Average exuvial length less than 4.5mm.

Psectrocladius oligosetus

684b. Populations with an average of over 30 taeniae on each anal lobe. Average exuvial length over 5.0mm.

Step 685. Orthocladiinae 97 Psectrocladius
Decision path