Larva a medium length plumosus - melanotus-type, very similar to that of sp. 3b but gular region darker and lateral projections shorter (about 0.18-0.20mm). Ventral tubules relatively long.
Cytology: 4 pairs of chromosomes with the
thummi arm combination AB, CD, EF, G.
Arm G with a median and terminal Balbiani ring, with a nucleolus and
heterochromatin at the other end. Nucleoli developed
subterminal in E (may be a double structure), proximally to the olive
in arm A and also proximal in C. Polymorphism in arms
A?, C, E and G.
Arm A1: 1a-2c, 10-12a, 13ba, 4a-c, 2g-d, 9-4d, 2h-3,
12cb, 13c-19 i.e. as anthracinus
Arm E1: 1-3e, 5a-e, 4gh, 10b-6, 4f-3f, 10c-13
ie. as annularius
Arm F1: 1-4b, 8c-4c, 17-13, 10-12, 9f-c, 8f-9b, 8ed, 18-23
Click here for the polytene chromosomes
Found: Saskatchewan - Crooked Lake, Pasqua Lake, &
Round Lake, Qu'Appelle River.
Indiana - Crooked Lake, Angola.
North
Dakota - Larimore Dam, Grand Forks, Co.; Warsing Dam, Eddy
Co.
Wisconsin - East Horsehead Lake, Oneida Co.;
Pleasant Lake, Walworth Co.
Lakes
Some information on arm F published by Martin (1979), Wülker, Devai & Devai (1989), under the name Species 9.