Larva of the plumosus-type, larger than larva of C. longistylus. Gular region completely dark, frontoclypeus with dark stripe and antennal pedicel darkened as in C. utahensis, ring organ about 0.4 of the distance from the base of antennal segment 1.
Cytology
: 4 pairs of chromosomes with the thummi arm combination
AB, CD, EF, G.
Arm G frequently paired in the constricted region, nucleolus at this
end with a large
Balbiani ring near the opposite end but separated from it by dark
bands. No nucleoli
in other chromosomes. Although polymorphism in arms A
and B is known in Europe,
no polymorphism has been recorded in North America.
Arm A1: 1-2c, 10-12, 3-2d, 9-4, 13-19;
i.e as
holomelas, longistylus,
etc.
Arm C1: 1-6b, 11c-8, 15-11d, 6gh, 17a-16, 7d-a, 6f-c,
17b-22 i.e. as in longistylus, tardus,
pilicornis
Arm D1: 1-3, 11a-c, 17-12, 18a-f, 7d-4, 10-7e, 18g-24.
Arm E1: 1-3e, 5-10b, 4-3f, 10c-13;
i.e. as
longistylus,
etc.
Arm F1: 1-10, 17-11, 18-23;
i.e. as in cucini, major
& tardus.
Found: Wisconsin - Crystal Bog (Lake 27-2), Vilas Co.
Morphology and cytology described by Wülker (1991a).