(Kieffer, 1922)
Body
Medium sized to large larvae up to 10 mm long. Body setae pale and indistinct. The anterior and posterior parapods are separate and bear rows of claws. Procercus with 5-7 anal and 2 subapical setae (Wiederholm, 1983).
Head
Antenna
The antenna consists of five segments. Segment 5 longer than or as long as segment 4. Segment 3 annulated Pot longim antenna. Lauterborn organs are small.
Mentum
The mentum and ventromental plates are absent Pot longim mentum.
Labrum
SI is simpel, labral lamellae are bifid or trifid. Pecten epipharyngis with three pointed scales. Premandible with about 15 teeth and a lateral spine.
Mandible
The mandible has an apical tooth and 3-4 inner teeth. The seta interna is absent (Wiederholm, 1983).
Differential characteristics
Potthastia longimanua stands out for having no mentum at all Pot longim mentum.