Larva of the plumosus-type but smaller than C. tenuistylus. Gular region darkened only at posterior; frontoclypeus pale; ring organ about 0.3 of the distance from the base of antennal segment 1.
Cytology
: 4 pairs of chromosomes with the thummi arm combination AB, CD, EF,
G. Centromeres
heterochromatic.
Arm G generally unpaired with a nucleolus near the heterochromatic
centromere, the
other end forming a fan-like structure terminated by dark bands, 2
Balbiani rings
near the nucleolus. A nucleolus is also present in arm
C. Polymorphism known in
arms B (Holarctic), D, F & possibly E (Nearctic).
Arm A1: 1 - 2c, 10 - 12, 3 - 2d, 9 - 4, 13 - 19
i.e as
holomelas, tenuistylus,
etc.
Arm C1: 1-6b, 11c-8, 15-11d, 6gh, 17a-16, 7d - a, 6f -
c, 17b-22 ie. as aberratus,
tenuistylus, etc.
Arm D1: 1 - 3, 11 - 18d, 7 - 4, 10 - 8, 18g - 24
ie. as tardus,
cucini, pilicornis.
Arm E1: 1 - 3e, 5 - 10b, 4 - 3f, 10c - 13
i.e. as tenuistylus,
etc.
Arm F1: 1 - 23
i.e. Standard, as piger,
sp. 3b, etc.
Found: Alaska - No name Lake, Haul Road, South Slope.
Morphology and cytology described by Wülker (1991a).