Adult of North American specimens was described by Townes (1945) as Tendipes (Einfeldia) dorsalis:
Female: Similar to male except for the usual sexual differences.
Pupa (from Langton & Visser (2003): Length 5.0- 5.4 mm.
Cephalic tubercles 75x55 µm, frontal setae 43 µm.
Basal ring of thoracic horn 78-97 x 33-40 µm. Thoracic granulation well-developed anteriorly and along suture, evanescent elsewhere.
Abdomen: Hook row of segment 2 complete, 50-66 hooks in row 0,45-0.48 of the width of the segment.
Abdomen colorless with sooty markings. The point patches are strong points, increasing in size posteriorly, and increase in extent from tergite II to V, but is reduced on VI. Spur of Segment VIII with 1 stout tooth and occasionally a small accessory tooth. Anal lobe with a fringe of 43-50 taeniae.
Larva a medium (female about 7.2 mm) plumosus-type (smallposterolateral tubules to about 160 µm) and well developed ventral tubules (ant. 1.20 mm; post. 1.36mm). Gula and frontoclypeus not darkened. Anal tubules about 250 µm, 3 times longer than wide
Mentum (Fig. c) with 4th lateral slightly reduced (type I-II), c1 relatively narrow and tall, with c2 teeth relatively well separated (type III).
Ventromental plates (Fig. d) separated by about 37-47% of mentum width; with about 42-47 striae reaching about half way to smooth anterior margin.
Pecten epipharyngis (Fig. a) with about 20-21 teeth (14 normal teeth, the others thinner teeth interspersed between the normal teeth). Premandible teeth sharp, the longer inner tooth about 50% wider than the outer tooth.
Antenna (Fig. b) with basal segment 3.25-3.85 times longer than wide; A2 quite long compared to A1 (A1/A2 only about 2.8); AR about 1.18-1.35; ratio of segments (micron) 90 : 32 : 8 : 13: 6.
Mandible (Fig. e) with third inner tooth partly separated and slightly darkened (type IIB), and with 12-15 furrows on outer surface at base.
Some larval characters of European material have been given by Vallenduuk and Langton (2010), who noted some differences between their German material and the more eastern samples of Shilova (1980). The antenna of our North American specimens has some characters similar to those of Shilova's (seg. 3 shorter than seg. 4), and others (AR) similar to the German specimens.
Cytology: 4 polytene chromosomes with the thummi-cytocomplex combination AB, CD, EF, G.
Arm G with a median nucleolus, a large BR just proximal to it and another BR near other end of chromosome. Other nucleoli on arms B and D.
dlsB1: Nucleolus (could be the BR found in other Lobochironomus species) near middle of the arm, typical bands 24-28 slightly removed
from the centromere (region "X" of Ryser et al. (1985) reversed?).
dlsC1: Large puff about one third from distal end.
dlsD1: Nucleolus near the centromere.
dlsE1: possibly 1 - 3c, 9 - 10a, 8i-a, 3ed, 10b, 5 - 7, 4 - 3f, 10c - 13
dlsF1: Bands 8-9 about one third from centromere.
Also occurs in Europe (France? (Type locality); Denmark (Type locality of C. longipes); England, etc.).
A Holarctic species.
DNA sequences: mtcox1 sequence in GenBank, Accession number DQ648200.
cytb sequence in GenBank, Accession number DQ648243.
18S rDNA sequence in GenBank, Accession number DQ657926.
Some larvae from Why Not Bog Lake in Wisconsin are similar to those of this species, but have very long lateral tubules, rather than the short ones found in the Madison egg mass larvae (see species 4v).
The larva of C. dorsalis from the Palearctic has been described by Vallenduuk and Langton (2010), who noted some differences between their German material and the more eastern samples of Shilova (1980). The antenna of our North American specimens has some characters similar to those of Shilova's (seg. 3 shorter than seg. 4), and others (AR) similar to the German specimens.