(Edwards, 1929)
Body
Medium sized larvae up to 7 mm long. The body setae form lateral pairs which are about 1/4 of the segment. The anterior parapods are separate. The two posterior parapods bear rows of claws. Procercus and two pairs of anal tubules present (Wiederholm, 1983; Moller Pillot, 1984b).
Head
In freshly preserved larvae the head is yellow with a black hindmargin and 0,44 - 0,52 mm long (Schmid, 1993).
Antenna
The antenna consists of 5 segments. The blade reaches the apex of segment 4. Lauterborn organs are present (Schmid, 1993).
Mentum
The mentum has one median tooth, which is appr. 4 x as wide as the first lateral, and 5 pairs of lateral teeth Euk gracei mentum. The ventromental plates are weak. The beard is absent.
Labrum
The pecten epipharyngis consists of three scales. SI is simpel (Wiederholm, 1983; Schmid, 1993).
Mandible
The mandible has an apical tooth and 4 inner teeth. The seta interna has simpel, serrate of plumose branche. The mola is serrated (Schmid, 1993).
Differential characteristics
E. gracei can be separated from the other Eukiefferiella species by the large size (length up to 7 mm and head 0.44 - 0.51 mm long). The broad median tooth is a character shared with E. gr-fittkaui, which is a much smaller species with a brown head.