Larva not available for study.
Cytology: 4 pairs of chromosomes with the thummi arm
combination, AB, CD, EF, G.
Arm G generally paired only at one end, a virtually terminal
nucleolus at the other
end; 2 or 3 Balbiani rings, variable in position due to
inversions. No nucleolus in long chromosomes.
Arm F seems to be derived from F3 of C. decorus
(Sp.3a). Quite polymorphic with
inversions in A, B, C, D, E and G.
Arm E (Seq. A): 1 - 3e, 8 - 5, 9 - 10b, 4 - 3f, 10c -
13
i.e. as
matE1, decE1, etc.
Arm E (Seq. S): 1 - 3e, 8i-e, 3f - 4,
10b - 9, 5 - 8d, 10c - 13
i.e. as decE2
Arm F: possibly 1a-d, 9 - 3d, 1i-e, 3c - 2d, 18 -
10, 2a-c, 19 - 23
i.e. as decF3+4
Found: Ontario - Don River, Toronto.
Slow moving river?
Chromosomes and chromosomal polymorphism described by Rothfels and Fairlie (1957). Some information of arm F given by Martin (1979).