Larva of the plumosus-type, length about 16 mm; ventral tubules quite long. Gula slightly darkened, frontoclypeus pale or slightly darkened. Mentum (Fig. c) with teeth pointed, c1 tooth with square sides, c2 teeth well separated (type IV); 4th laterals slightly reduced (type I - II). Ventromentum (Fig. d) with about 39 - 40 striae. Pecten epipharyngis (Fig. a) with about 14 sharp but irregular teeth. Antenna (Fig. b) with basal segment about 4 times as long as wide; AR about 2. Mandible (Fig. e) with third inner tooth pale but separated (type II - III). Anal tubules quite long.
Cytology: 4 pairs of chromosomes with thummi arm combination AB, CD, EF, G, but Keyl pattern hard to recognise.
Arm G mostly paired although ends may be unpaired and uneven; median Balbiani ring. Nucleolus in arm A (near bands 4-6, making pattern hard to identify) and arm D. Puff, with proximal dark bands (groups 8-7), almost terminal in arm B. Balbiani ring in arm E.
Click here for the polytene chromosomes.
Found: Ontario - 2 ml. s. & w. Clarence Creek, Russell Co., Barron Creek, nr. Squirrel Rapids, Algonquin Provincial Park.
Quebec - King Mt., Gatineaus.
Snow melt pools and other small pools.