Male terminalia of C. atrella (left)
with superior appendage (right)
Adult described by Townes (1945)
Pupa: pupal spur with only one or two spines.
Larva a small to medium plumosus type (len. female abt 9.4 - 16.5 mm; male 10.4 - 11.5 mm), ventral tubules moderately long and about equal length. Gular region darkened on posterior third, frontoclypeus pale. Mentum with rounded teeth, c1 tooth rather narrow, c2 teeth moderately seperated type I). Pecten epipharyngis with about 11 - 14 teeth. Mandible with 3rd inner tooth only partly separated (type II).
Cytology: 4 pairs of relatively short chromosomes with thummi arm combination, AB, CD, EF,
G.
Centromeres not heterochromatic. Arm G very short and paired only at the terminal nucleolus. Large nucleolus
in arm B and a smaller one in arm F at about group 11. Arm C unpaired in some specimens. Polymorphism
in all arms except G.
atrA1: 1a - e, 2d - 3, 12 - 10, 2c - 1f, 9 - 4, 13 - 19
atrA2: 1a - e, 8 - 9, 1f - 2c, 10 - 12, 3 - 2d, 7 - 4, 13 - 19
atrC1: 1 - 3, 8 - 11c, 4a - i, 6b - 5, 15 - 11d, 6gh, 17a - 16, 7d - a, 6f - c, 17b - 22
atr C2: 1 - 3, 4g - a, 11c - 8 4b - i, 6b - 5, 15 - 11d, 6gh, 17a - 16, 7d - a, 6f - c, 17b - 22
atrC3: 1 - 3, 8 - 11c, 4a - i, 6b - 5, 12 - 15e, 11h - d, 6gh, 17a - 16, 7d - a, 6f - c, 17b - 22
atrC4: 1 - 3, 4f - a, 11c - 8, 4g - i, 6b - 5, 12 - 15e, 11h - d, 6gh, 17a - 16, 7d - a, 6f - c, 17b - 22
atrD1: 1 - 3, 11 - 18d, 7 - 4, 10 - 8(7e), 18e - 24; ie. as in longistylus
atrD2: 1 - 3, 17 - 11, 18a - d,7d - 4, 10 - 7e, 18e - 24
atr D3: 1 - 3e, 5d - 4, 10e - a, 7 - 5e, 11 - 15d, 18d - 15e, 3fg, 9 - 8, 18e - 24
atrE1: 1a - 3e, 10b - 3f, 10c - 13g; ie. as in aprilinus
atrE2: 1a - e 10b - 9, 7 - 8, 6 - 3f, 10c - 13
atrF1: 1a - f, 9 - 3c, 14 - 10, 1g - 3b, 15 - 23
atrF2: 1a - f, 9 - 3c, 14h - a, 16 - 15, 3b - 1g, 10 - 13, 17 - 23
atrF3: 1a - f, 9 - 5d, 13 - 14, 3c - 5c 12 - 10, 1g - 3b, 15 - 23
atrF4: approx: 1a - f, 9 - 6, 15 - 16, 14a - h, 3c - 5, 3b - 1g, 10 - 13, 17 - 23 ie. inv of F2
Click here for the polytene chromosomes.
Found: Ontario - 'Copanspin Farm' Dunrobin; 0.5 ml e. Dunrobin; South March; Hogs
Back, Ottawa (all Carleton Co.).
California - Lake Davis, Plumas Co.; Fish hatchery Spring Valley, San Diego Co.
Indiana - Crooked Lake, Noble Co.
Minnesota - Lake Christina, Douglas Co.; Audubon, Becker Co.
New Mexico - Eagle Nest Lake, Colfax Co.
North Dakota - Fuller Lake; Larimore Dam, Grand Forks Co.; McVille Dam, Nelson Co.;
Warsing Dam, Eddy Co.
Wisconsin - Reader Farm, Madison, Dane Co.
Prairie sloughs, larger pools, and lakes.
Species Ea of Butler, and then C. nr. anthracinus of Butler et al. (1995). Polytene chromosomes fully described by Martin et al. (2006).