Key: Step 645. Orthocladiinae 57 Hydrobaenus

645a. Exuviae less than 4mm long. Thoracic horn less than 300µm long.

Hydrobaenus martini

645b. Exuviae at least 4.5mm long. Thoracic horn 350µm or more long.

Step 646. Orthocladiinae 58 Hydrobaenus
Decision path