(Goetghebuer, 1921)
Body
Small sized larvae with a length up to 5 mm. Color pale and the fringe of swimming hairs absent (Wiederholm, 1983; Moller Pillot, 1984a).
Head
The head length is 0.45 - 0.55 mm, more than twice as long as wide with a cephalic index of 40 - 45%. The head is widening behind the eyes with a flattened hump covered with points Lab head (Moller Pillot, 1984a)
Antenna
The second antennal segments is light brown and the antennal ratio is 2. The ring organ is situated at 0.7 - 0.95 of the height of the first segment. The second segment lacks a tuning fork (Wiederholm, 1983; Moller Pillot, 1984a).
Mentum
Dorsomentum without teeth.
Ligula and paraligula
Ligula with 5 brown teeth. The middle and second lateral teeth in a convex row. The first lateral teeth smaller Lab ligula. Paraligula with a long outer and a smaller inner tooth (Wiederholm, 1983; Moller Pillot, 1984a).
Mandible
The mandible has a large basal tooth.
Maxilla
The maxilla is short with an undivided basal segment,
Anal tubules
4 anal tubules very slender and half as long as the posterior parapods.
Posterior parapods
The posterior parapods are long and slender with a seta, half as long as the parapods and with a serrated base Lab seta on post. parapod. All claws on posterior parapods are yellow. One small claw with an inner tooth that is larger than the outer tooth Lab claw (Moller Pillot, 1984a).
Differential characteristics
The toothed hump on the slender head Lab head, the convex ligula Lab ligula, the slender posterior parapods Lab seta on post. parapod and small size are distinctive. Nilotanypus is the closest relative, also small sized and with a ligula with a convex row of teeth. Nilotanypus lacks the toothed hump on the head, has one claw with a comb of inner teeth and inhabits streams, whereas Labrundinia lives in acidic lakes and bogs.