Larva a large, generally semireductus-type, anterior ventral tubules straight and tapering only near the tip (Butler, unpubl.). Pale frontoclypeus, darkened gular region. Russian workers report differences in head coloration pattern to those of C. plumosus, but these have yet to be confirmed in North American material.
Cytology: 4 pairs of relatively short chromosomes with
thummi arm combination AB, CD, EF,G.
Very similar to C. plumosus.
Arm G more commonly partly paired, with a large virtually terminal
nucleolus; Balbiani
ring near middle of arm below the nucleolus. Arm A most commonly
with the Holarctic sequence A4. Polymorphism in arms A, B, D, E and
F.
Arm A4: 1-2c, 10-12a, 13ba, 4a-c, 2g-d, 9-4d, 2h-3,
12c-b, 13c-19; i.e as
plumosus A2
Arm A11: 1-2c, 10-12, 14f-13, 3-2h, 4d-9,
2d-g, 4c-a, 14g-19
from h'ent A1
Arm A12: 1-2b, 12a-10, 2c, 12bc,
14f-13, 3-2h, 4d-9, 2d-g, 4c-a, 14g-19
from A11
Arm A13: 1-2c, 10-12, 14f-13, 3-2h, 4d-9, 2d-g, 4c-a, 14g-i,
17d-15, 17e-19
from A11
Arm A14: 1-2c, 10-12, 14f-13, 3-2h, 4d-9, 2d-g, 4c-a, 14g-i,
17-15, 18-19
from A11
Arm A15: 1-2c, 10ab, 7d-9, 2d-g, 4c-a, 13ab,
12a, 11-10c, 7c-4d, 2h-3, 12cb, 13c-14, 17-15,
18-19 from A4 & recomb with A14.
Arm B: Balbiani ring near distal end of the arm
Arm C3: 1a, 11h-d, 6gh, 17a, 16h-a, 7-6c, 2c, 5-6b,
11c-8, 15-12, 1b-2b, 4-2d, 17b-22
Arm D1: 1-2d, 15e-16c, 18cd, 8-10a, 13a-12, 18ba, 7-4,
10e-b, 13b-15d, 2e-3, 11a-c, 16d-17,
18e-24
Arm D4: 1-2d, 15e-16c, 18cd, 8, 19-18e, 17-16d, 11c-a, 3-2e, 15d-13b, 10b-e, 4-7, 18ab,
12-13a,
10a-9, 20-24
Arm E1: 1-2b, 11b-10c, 3f-4, 10b-5, 3e-2c, 11c-13;
i.e. as muratensis
(alt. E1): 1-2b, 11b-10c, 3f-4b, 3b-e, 10b-4c, 3a, 2e-c,
11c-13 (see Kiknadze et al. 2000)
Arm E5: 1a-g, 10c-11b, 2b-1h,
3f-4, 10b-5, 3e-2c, 11c-13
pEF(E6+F5): not mapped
Arm F1: 1a-d, 6-1e, 7-10, 17-11, 18-23
Arm F4: 1a-d, 6-1e, 19-18, 11-17,
10-7, 20-23; i.e. as
plumosus F3
Arm G3: differs by inversion from Palearctic populations.
Found: British
Columbia - Near Opposite Crescent, Bechers Prairie, Cariboo
and Chilcotin
Parklands (Canning);
Manitoba - Winnipeg;
Ontario - Bay of Quinte, Belleville; White
Lake, Three Mile Bay;
Saskatchewan - Lake Waskesiu, Prince Albert
National Park; Pasqua Lake, Qu'Appelle River.
Indiana - Crooked Lake, Angola Co.; Manitou
Lake;
Minnesota - Lake Itasca; Lake Christina, Douglas
Co.
North
Dakota - Brewer Lake; Dead Colt Creek Dam, Ransom Co.; Silver
Lake, Sargent
Co.
Oklahoma - Buncombe Creek, Marshall Co.
Wisconsin - East Horsehead Lake, Onieda Co.; Grand
Portage Lake, Iron Co.; Green Lake;
Little Green Lake, Green Lake Co.;
Lake Kengonsa, Dane Co.;
Pepin Lake, Pine Lake,
Pleasant Lake, Winnebago Lake, Yellow Lake
Found in lakes, often with C. plumosus.
Cytology described by Kiknadze et al. (2000a, & b)