(Edwards, 1929)
Subgenus Psectrocladius
Body
Medium sized larvae up to 10 mm long. The anterior and posterior parapods are separate and bear rows of claws. Procercus weakly sclerotized with 2 - 3 (4) spurs Psec barbimanus procercus and two pairs of anal tubules present (Wiederholm, 1983; Moller Pillot, 1984b).
Head
The head length is 0.6-0.7 mm (Moller Pillot, 1984b).
Antenna
The antenna consists of five segments. The blade is shorter than the flagellum. Lauterborn organs are small or absent.
Mentum
The mentum has two median teeth Psec barbimanus mentum and 5 pairs of lateral teeth. The ventromental plates are larve covering some lateral teeth. The beard is distinct.
Labrum
The pecten epipharyngis consists of three subequal spined scales, SI is palmate Psec barbimanus S1 and the premandible has one apical tooth (Wiederholm, 1983; Moller Pillot, 1984b).
Mandible
The mandible has an apical tooth which is about as long as the combined inner teeth. The seta interna is present (Wiederholm, 1983).
Differential characteristics
The combination the palmate SI Psec barbimanus S1 on the labrum, beard present and procercus with spurs Psec psilopterus procercus9 is distinctive for the genus Psectrocladius.
P. barbimanus can be separated from the other Psectrocladius by 2 mid-mental teeth equal in height as the first laterals and head length 0.6 mm.