(Nowicki, 1873)
Body
Large larvae up to 16 mm long. Body setae pale and indistinct. The anterior and posterior parapods are separate and bear rows of claws. Procercus is conspicuous and sclerotized with 6-8 anal setae and 2 subapical seta (Wiederholm, 1983).
Head
Antenna
The antenna consists of five segments. Segment 5 longer than segment 4. Segment 3 annulated. Lauterborn organs as long as segment 3 + 4.
Mentum
The mentum has one median tooth and 7 pairs of lateral teeth, most of which are hidden behind the large ventromental plates Pseudodiam mentum.
Labrum
The pecten epipharyngis consists of 7 long scales, SI is simpel and the premandible has 8 - 11 apical teeth (Wiederholm, 1983).
Mandible
The mandible has an apical tooth and 4 inner teeth. The seta interna with 13 - 17 smooth to weakly serrated branches (Wiederholm, 1983).
Differential characteristics
The annulated 3d antennal segment is characteristic for the subfamily Diamesinae. The large ventromental plates Pseudodiam mentum and the sclerotized procercus separates P. branickii from all the other Diamesinae.