Species v.

Adult and Pupa - not known, unless some adults are in the Canadian National Insect Collection.

Fourth instar larva a large (abt. 13-13.5 mm)halophilus-type, although some specimens, e.g. at Isachsen, are salinarius-type.  Dark posterior half of gular region, extending beyond edges of mentum and higher at edges; dark frontoclypeus, rest of head also darker in salinarius-type larvae.  Ventral tubules 0.58-0.73 µm (ant.) and 0.83 µm (post).  Anal tubules about 405-480 µm (dors.), 435-455 µm (vent.) long and 2.1-2.4 (dors.), 1.93-2.0 (vent.) times longer than wide.  Epipharyngeal apperture 88-134 x 20-30 (2.8-4.4 times longer than deep).
Mentum with rounded teeth; c1 tooth with short outward sloping sides before becoming curved, c2 teeth well seperated, probably worn type IIA; fourth laterals slightly reduced (type I-II).
Ventromentum abt. 253-280 µm wide and 3.4-3.6 times wider than deep, with about 45-53 striae, IPD abt. 0.3; VMR about 0.28-0.33.
Pecten epipharyngis with about 8-11 irregular, often broad and rounded, teeth (type D); this broad tooth development is also seen in C. hyperboreus which is sometimes found in the same pools.  Premandible with relatively short broad teeth; outer tooth about a third the width of the inner tooth (type D).
Antenna with relatively long basal segment (about 2.9-3.6 times longer than wide and abt. 0.4 of ventral head length); RO about a third up from base of segment; AR about 2.08-2.16; segment proportions (micron) 160 : 37 : 15 : 16 : 9.
Distance between the antennal bases and that between the S4 setae about equal; S4 setae separated by about 0.8 of frontoclypeus width.  S5 setae posterior of nearby RO.
Mandible about 300µm with 15-18 furrows on outer surface near base, 3rd inner tooth only slightly developed (type IIA); about 15-18 taeniae in Pecten mandibularis; MTR about 0.26

Cytology  4 relatively short polytene chromosomes, with the pseudothummi arm combination, AE, BF, CD, G, but Keyl pattern hard to recognise.
Arm G rather indistinct, usually unpaired, with a terminal nucleolus.  Arm A sometimes unpaired.  According to Wülker (pers. comm.), arm A has the holomelas banding sequence.

Arm A:    1 - 2c, 10 - 12, 3-2d, 9 - 4, 13 - 19                            i.e. as holomelas
Arm B:    Puff near middle of the arm with dark bands on proximal side.
Arm C:    Constriction about 1/4 from distal end
Arm E:    possibly 1 - 13                                                                i.e. as pseudothummi, etc.
Arm F:    possibly 1, 11-12, 19 - 16, 2 - 10, 15 - 13, 20 - 23                i.e. as acidophilus
Arm G:    terminal nucleolus

Mentioned briefly by Wülker & Martin (2000).