Jackson, 1977
Body
Small to median sized larvae up to 5 mm long. Living larvae red. Claws on the posterior parapods are simpel. No lateral and ventral tubules. Procercus and anal tubules present (Nocentini, 1985).
Head
Antenna
The antenna consists of 6 segments. The blade is shorter than the flagellum. Lauterborn organs are absent Saetheria antenna.
Mentum
The mentum has one broad median tooth paler than the 6 - 7 pairs of lateral teeth. The first lateral may be partly fused with the median tooth Saetheria mentum or free Saeth 9Lip ment. The ventromental plates are 0.75 - 1.2 x the width of the mentum.
Labrum
SI is simpel and labral lamellae are absent. The pecten epipharyngis is a small triangular plate. The premandible with 4 - 5 teeth.
Mandible
The mandible without a dorsal tooth, apical tooth and 3 Saeth 9Lip mand pict or 4 inner teeth present Saetheria mandibl. The pecten mandibularis is present.
Differential characteristics
Saetheria and Kloosia are the only genera with a 6-segmented antenna and missing Lauterborn organs. The body of Saetheria is somewhat slender, but nowhere near as thin as Kloosia.
Diversity
European species: 2 or more
Treated species:
Saetheria sp. 9 Lipina
Saetheria sp. Nocentini