Larva a large plumosus-type. Very dark gular region, pale frontoclypeus. VHL about 360 micron (300 - 400). Mentum with pointed teeth, c1 tooth broad, c2 teeth well seperated and sharp pointed (type II); fourth laterals slightly reduced(type I-II). Ventromentum with finely crenullated anterior margin, median edges sharply downturned. Pecten epipharyngis with 13 - 20 irregular, conspicuous large and small teeth. Antena with basal segment about 3.2 times as long as wide (3.09 - 3. 50); antennal proportions 141 : 30 : 9 : 13 ; 6. Mandible polymorphic for presence or absence third inner tooth.
Cytology: 3 pairs of chromosomes with a
modified thummi arm combination. AB, CD, GEF.
Arm G normally paired with a nucleolus near attachment to arm E, with
nearby Balbiani ring and sometimes
an additional puff. Nucleolus in arm B near 4
characteristic bands. Polymorphism in arms A, B,
C and D.
crc A1: 1 - 2c, 10 - 12, 3 - 2d, 9 - 5e, 17d - 13, 4 -
5d, 17e - 19
crc A2: 1a-e, 12-10d, 13-17d, 5e-9,
2d-3, 1f-2c, 10a-c, 4-5d, 17e-19 i.e. a complex
inversion
crc B1: Puff with distal dark bands (groups 8-7) about
1/3 from distal end.
crc B2: Puff with proximal dark bands
(groups 7-8) still about 1/3 from distal end.
crc E1: 3e - 1, 3f - 10b, 12e - 10c, 12f - 13
crc F1: 1 - 6a, 6d - 9 6b - c, 17 - 11d, 19 - 18, 10 -
11c, 20 - 23
Found: Ontario -
Trenton, Ottawa & Point Pelee (Townes 1945)
Arkansas - Marianna, Lee Parish.
Florida - Cannon Lake, Polk Co., Miccosuccee
Lake.
Georgia - Lagos Pond, nr Athens & 5 ml w
Athens, Clarke Co.; Lullwater Lake, DeKalb Co.
Illinois - 3.5 ml n.e. Mahomet, & Homer Park,
Champaign Co.; Peoria, Peoria Co. (Type), (Townes 1945)
Indiana - Shafer Lake.
Iowa - Davenport & Kossuth Co. (Townes 1945)
Kansas - Potters Lake, Lawrence, Douglas Co.;
State Park, Leavenworth, Leavenworth Co. (Townes 1945)
Louisana - Natchitoches, Natchitoches Pa.
Maryland - Fenwick, Charles Co. (Townes 1945)
Michigan - Midland Co. (Townes 1945)
Minnesota - Hennepin Co. & Traverse Co. (Townes
1945)
Nebraska - no locality (Townes 1945)
New
Jersey - Wildwood (Townes 1945)
Oklahoma - Buncome Creek Bay, Lake Texoma,
Marshall Co.; Oklahoma City (Townes 1945)
Pennsylvania - Philadelphia (Townes 1945)
South
Dakota - Yankton; Lake francis Case; Gavins Point national
Fish Hatchery.
Tennessee
- Oak Ridge, Anderson Co.; Reelfoot Lake.
Texas - Brownsville & Lake Refugio at Twin Mott
(Townes 1945)
Wisconsin - Lake Wingra, Dane Co., East Horsehead
Lake, Oneida Co.
Lakes and other lentic habitats
Morphology and cytology described by Wülker et al. (1971).