Kieffer, 1911
Body
Small larvae up to 4 mm long. Living larvae can be violet (T. acuticornis) The thorax has only two segments. Only T. fusca has numerous stout setae on the body. The anterior and posterior parapods are separate and bear rows of claws. Procercus and two pairs of anal tubules present (Wiederholm, 1983; Moller Pillot, 1984b).
Head
The head length is appr. 0.3 µm (Moller Pillot, 1984b).
Antenna
The antennal length is 50 -75% of the head length and consists of five segments of which segment 2 may be brown. The blade is short and the Lauterborn organs are small.
Mentum
The mentum has two Thienella flaviforc mentum or three median teeth Thienella clavicornis mentum9 and 5 pairs of lateral teeth. The ventromental plates are weak. The beard is absent.
Labrum
The pecten epipharyngis consists of three triangular spines, SI is weak and the premandible has one apical tooth (Wiederholm, 1983; Moller Pillot, 1984b).
Mandible
The mandible has an apical tooth and 4 inner teeth. The seta interna has plumose branches (Wiederholm, 1983).
Differential characteristics
The antenna of Thienemanniella is distinctive, shorter than the antenna of Corynoneura and not on a pedestal like Heterotanytarsus Antenna half headlength.
Diversity
European species: 9
Treated species:
Thienemanniella acuticornis
Thienemanniella cf. majuscula
Thienemanniella clavicornis
Thienemanniella flaviforceps
Thienemanniella partita
Thienemanniella vittata