Larva a large plumosus-type. Gular region slightly darkened with frontoclypeus darkened particularly in the centre. Mentum with rounded teeth; c1 tooth broad with short parallel sides, c2 teeth quite well separated (type I). Pectin epipharyngis with about 12 broadly rounded or flat teeth (Hilsenhoff & Narf 1968).
Cytology: 4 pairs of chromosomes with the
Camptochironomus arm combination AB, DE, CF, G.
Arm G with 3 Balbiani rings but no nucleolus. Position
of Balbiani rings variable
due to the polymorphisms; arms B and C with a nucleolus near the
centromere, nucleolus also in arm D with an extra band.
Chromosome polymorphism in arms A, C, D, E, F and G. The
male sex determiner is on arm C near the centromere, but the female
sex determiner reported by Thompson
(1971) does not actually exist (Martin and Lee 1984).
Arm A1(nA1): 1a-b, 8c-7b, 3i-7a, 1g-c, 8de, 17-13,
1h-2c, 9c-8f, 10-9d, 11-12, 3h-2d, 17g-19
Arm A2(nA2):
Arm B1(nB1):
Arm B2(nB2):
Arm B3(nB3):
Arm C1(nC1): 1-2d, 4g-6b, 9-11c,3c-2e, 11d-14c, 19-16,
7d-a, 6h-c,8, 15-14d,4a-f, 20-22
Arm C2(nC2):
Arm D1(nD1): 1-2b, 15-14, 10, 4-7, 2c-3, 13, 22-18e,
8-9,17-18d, 12-11, 16e-a, 23-24 as pD1, except for
nucleolus and extra band in 10B
Arm D2(nD2): as pD2?, except for nucleolus and extra
band in 10B
Arm D3(nD3):
Arm E1(hE1): 1-2b, 7h-8, 9-10b, 3e-2c, 7g-3f, 10c-13
Arm E2(hE2):
Arm E3(nE3):
Arm F1(nF1): 1 2, 7-9, 16, 6-3, 15-10, 17-23;
as pF3 in Europe
Arm F2(nF2):
Arm F3(nF3): 1a-d, 9b-12, 3b-2,
13a-d, 1i-e, 3c-5c, 16-14d, 7-9a, 6-5d, 14c-a, 2a-e, 17-23
Arm F4(nF4):
Arm G1(hG1):
Arm G2(hG2):
Arm G3: (nG3)
Click here for the polytene chromosomes
Found: Numerous localities across the northern
U.S. and Canada.-
Alberta - Elkwater; Lacombe.
British Columbia - Chilcotin area, Williams
Lake, Kamloops, Sawmill, Westwick, Sorenson,.
Manitoba - St. Alphonse; Churchill.
Ontario - Hogs Back, Ottawa; Kars Creek, Kars;
Toronto.
Quebec - Montreal.
Saskatchewan - Big Quill Lake; 6ml. n. & e.
Colgate; Lake Waskesiu, Prince Albert Park;
6ml. s. & w.
Stoughton; 5ml. w. Theodore.
Iowa - Lake Okoboji & Jemmerson Slough,
Dickinson Co.; Little Wall Lake, Hamilton Co.;
Cerro Gordo Co.
Massachusetts - Longmeadow
Minnesota - Badger Lake, Erskine; Lake
Christina;
New
York - Ithaca.
North
Dakota - Warsing Dam, Eddy Co.; Braddock Dam, Emmons Co.;
Fullers Slough;
Hankinson.
South
Dakota - Lake Francis Case; Gavins Point National Fish
Hatchery.
Utah - Logan;
Wisconsin - Stevens Pond & U.W. Arboretum,
Madison, Dane Co.
Wyoming - 6ml s Lander.
In prairie sloughs, shallow eutrophic lakes and ponds, sewage oxidation lagoons.
Larva described by Johannsen (1938).
Chromosomes have been shown in a number of papers,
e.g. Thompson (1971), Firling and Kobilka (1979), Martin (1979); full karyotype, using
Beermann
maps, published by Kiknadze et al.
(1996a). Keyl
(1962) gives the sequence of arm F on his scheme, including IR-2 =
pF3 = nF1 (Kiknadze et al. 1996a).
Other sequences from Kiknadze et al.
(2004). Acton and
Scudder (1971) consider North American populations to comprise
three races - Alaskan, west Canadian, east Canadian.
Formerly considered a synonym of C. tentans Fabricius,
the North American material clearly differs genetically from the
Palearctic species
and was renamed by Shobanov et al. (1999).