Klink, 1982a
Body
Medium sized larvae up to 8 mm long. A very shallow hump is present on the 11th segment. The L2 setae on the abdomen are simpel Microps atr L2 pict. The posterior parapods bear about 50 simpel claws Microps gr atrof claws.
Supra-anal-setae are fine and hardly visible at 80 x magnification (Klink, 1982a; Wiederholm, 1983).
Head
The headcapsule pale and the S3 is simpel.
Antenna
The antenna pale and stands on a pronounced pedestal with a small apical spur Mips small spur ant pedestal. The distance between the antennal pedestals at most 38 µm. The basal segment 265 - 360 µm long. Segment 2 is cylindrical and longer than the remaining segments. The small Lauterborn organs distally on segment 2 with a very long pedestal.
Mentum
The mentum has a crenate median tooth and 5 pairs of lateral teeth Micropsectra mentum. The ventromental plates are close together medially and wider than the mentum.
Labrum
SI is a comb, SII is serrate with the teeth shorter than the apex and labral lamellae a single plate with 22 - 28 apical teeth. The pecten epipharyngis consists of 3 scales with distal teeth. The premandible with 2 teeth Mips labrum pe premandible.
Mandible
The mandible with a dorsal tooth, one apical tooth and 3 inner teeth all brown. The pecten mandibularis is present and seta interna with branches.
Differential characteristics
Distinctive for most species is the small apical spur on the antennal pedestal Mips small spur ant pedestal. M. bidentata with a large projection Mipsbi large distal proj ant p can be separated from Tanytarsus gr. brundini by the larger number of claws and Micropsectra fusca (with a bare pedestal and a distinct hump on the 11 segment) can be separated from Krenopsectra by its much larger size (10 mm vs 5 mm in Krenopsectra).
M. sterkselse-Aa can be separated from the other Micropsectra by:
The simpel L2 on the abdomen Microps atr L2 pict, small (50) number of claws on posterior parapods, first antennal segment 265 µm, pedestals separated by at most 38 µm and fine supra-anal setae.