Larva a medium sized bathophilus-type, but with small lateral projections, about 100 μm long; ventral tubules about equal length. Dark gula, pale or slightly darkened frontoclypeus and bases of antennae darkened. Mentum with somewhat rounded teeth; centre (c1) tooth relatively narrow with short parallel sides, c2 teeth well seperated (type IV).
Cytology: 4 pairs of chromosomes with the thummi arm combination AB, CD, EF, G. Arm G closely paired, without a nucleolus, but with a Balbiani ring towards one end, the position varying due to an inversion. The end near the BR is almost square due to a constriction, while the other end is fanned. Nucleolus in arm D. Polymorphic in arms A, D, E, F and G.
uta A1: 1a-e, 7
- 4, 13 - 15, 3e - 2d, 9 - 8, 3f-i, 12 - 10, 2c - 1f, 16 - 19
uta
A2: approximately 1a-e, 7 - 4, 13 - 15, 3e-b, 9, 2d-3a, 8, 3f-i, 12 - 10, 2c - 1f, 16 -
19
uta B1: Puff with distal dark bands (groups 7-8)
near distal end of the arm, small BR in proximal third of
arm.
uta E1: 1 -3e, 5 - 7c, 12 - 10c, 3f - 4, 10b -
7d, 13a-g ie.
differs from aberratus by Inv 12-7d
uta F1:
1, 9 - 2, 17 - 13c, 11 - 13b, 10d-a, 18 - 23
uta F2:
approximately 1, 14 - 13c, 2 - 9, 15 - 17,
11 - 13b, 10d-a, 18 - 23 differs from F1 by two
overlapping inversions
Click here for the polytene chromosomes.
Found: Alberta - Elk
Lake; Lesser Slave Lake (Townes 1945).
Arizona - Shultz Pass
Tank and Lower Lake Mary, near Flagstaff, Coconino Co.
California - 1.7 ml Benton Hot Springs, Mono Co;
nr Spring Valley Lake, Apple Valley, San
Bernadino Co.; Alkali Lake, Antelope
Valley (Townes 1945).
Colorado - Fort Collins (Townes
1945).
Minnesota - Sand Lake (Townes 1945).
Montana -
2 ml s. Ronan, Lake Co.
Nevada - Reno; Wells (Townes
1945).
North Dakota - Dead Colt Creek Dam
New
Mexico - Mineral Springs, Taylor Springs, Colfax Co.; Eagle
Nest Lake, and Miami Lake,
Colfax Co.;Upper Abbott Lake, Harding
Co.
Oregon - Upper Klamath Lake, 1 ml Williamson
River, Klamath Co.
South Dakota - Wagner, Charles Mix
Co.
Utah - Kaysville (Type); Bear River Bay; Great
Salt Lake; Honeyville; Magna; Plain City (Townes 1945).
Ponds and lakes in western and central North America.
Morphology and cytology described by Wülker Sublette & Martin (1991), which corrects a minor error in the arm E sequence in Martin, Sublette, Sublette (1979). A photograph of the karyotype was also published in Schaller & English (1976).