Diamesa bertrami- type (Fig. 9)

Head capsule entirely dark brown. Apex of mentum with five tall, prominent teeth, median tooth single, second is taller than first, and 8 pairs of smaller lateral teeth, last one is minute. Mandible with a distinctive shape: first two inner teeth obviously long, second tooth is longer than first one.

Remarks: The D. bertrami - type described by Brooks et al. (2007) has apex of mentum with 6 teeth, i.e. median tooth is double. Rossaro & Lencioni (2015) report a single median tooth in some specimens of D. bertrami .