Larva a large plumosus-type, ventral tubules long, usually anterior pair longer (Female: Ant. 2.52 mm (2.20 - 3.00), Post. 2.15 mm (1.68 - 2.48); Male: Ant. 2.31 mm (1.84 - 2.64), Post. 1.98 mm (1.64 - 2,32)). Dark to very dark gular region, pale frontoclypeus. Ventral head length (VHL) about 290 micron (330 - 430). Mentum with pointed teeth; c1 tooth with parallel sides, c2 teeth well developed (type II); 4th laterals slightly reduced (type I-II). Ventromentum with anterior margin finely crennulated; about 75 - 88 striae. Pecten epipharyngis with about 11 - 19 teeth, larger near the center, diminishing in size laterally. Antenna with basal segment about 3 times as long as wide (2.8 - 3.5); AR about 2.14 - 2.42; antennal proportions 148 : 38 : 8 : 12: 7.
Identification: The larva of this species can be recognized by the combination of characters: large plumosus-type, dark gula and frontoclypeus, about 60 - 90 striae on ventromentum, which has a crenullated anterior margin.
Cytology: 4 pairs of chromosomes with the thummi arm combination AB, CD, EF, G.
Arm G closely paired with a virtually terminal nucleolus and a central Balbiani ring (BR);
chromosome narrows from BR to nucleolus. Nucleolus also in arm B, just distal to
the 4 characteristic bands. Inversion polymorphism in arms C and D.
fro A1: 1a-e 7 - 5e, 3 - 2d, 9 - 8, 13 - 17d, 1f - 2c, 10? - 11?, 4? - 5d, 17e - 19
fro B1: Puff with proximal dark bands (groups 7 and 8) at distal end of arm.
fro E1:1 - 3a, 10b - 3f, 10c - 13; i.e. as halophilus,
etc.
fro F1: 1 - 6a, 6d - 9, 6b - c, 17 - 10, 18 - 23
fro F2: 1 - 5, 17, 6c-b, 9 - 6d, 6a, 16 - 10, 18 - 23
Found: California - Antioch, Contra Costa Co.: 4 ml e. Olive, Los Angeles Co.; O'Neil
Forebay
and San Luis Reservoir, Merced Co.; Lake Crowley, Bishop, Mono Co., Greenfield,
Monterey Co.; 1 ml s. Napa, Napa Co.; Lake Elsinore, Riverside Co.; Lake Merced,
San Francisco Co.; San Mateo Co.; Lake Dalwigk, Vallejo, Solano Co.
Oregon - Upper Klamath Lake, 1 ml n. Williamson River; Smith Loop Road, 7 ml. s. Corvallis.
Lakes, oxbows and permanent ponds.
The morphology and cytology have been described by Wülker et al. (1971).
This was Species 8 of Wülker.
Sublette & Sublette originally designated the species authors as Atchley and Martin, 1971, but Spies (2000) designated a lectotype and corrected the author designation.