Key: Step 549. Diamesinae 25

549a. At least abdominal segments IV-VIII dorsally and ventrally with a single row of teeth posteriorly. Thoracic horn narrow, pointed at apex, or absent. Anal lobes rounded or truncate posteriorly, with or without an apical triangular projection.

Step 550. Diamesinae 26 Syndiamesa

549b. Without this combination of characters.

Step 589. Orthocladiinae 1 Metriocnemus
Decision path