Cytology: Four polytene chromosomes with the pseudothummi-cytocomplex combination BF, CD, AE, G. Nucleoli in arm B and C, with a small one also present subterminal in arm G (which is not always present/active). Arm G closely paired with generally 3 obvious BRs from near the nucleolus to the opposite end, depending upon the sequence.
Polymorphism in arms A, B, C, D and G, although Pamual et al. report pericentric inversions involving the AE and BF chromosomes. The largest number of inversions is in arm B.
cirA1: 1 - 3, 12 - 4, 13 - 19 (widespread) as pseudothummicirA2: 1 - 2c, 10 - 12, 3 - 2d, 9 - 4, 13 - 19 as holomelas (widespread)
cirA3: approx. 1 - 2d, 11 - 12, 3 - 2e, 10 - 4, 13 - 19 (Thailand)
cirA-E(called A4): A1-3, 12-5, E11-13, A6-4, 13-19, E 10i-c, 3f, 3a-e, 10ba-4, 2-1 (India & Thailand)
cirB1: Puff near nucleolus, with dark bands on distal side (gps. 8 - 7) (widespread)
cirB2: Puff just beyond middle of arm with dark bands proximal (gps 7 - 8): (widespread)
cirB3: abt same size as B2, but moved a few bands proximal, ending at nucleolus (India)
cirB4: small inversion distal of the distal break of B2 (Thailand)
cirB5: Similar to B2, but about 2-3 bands shorter at each end (Thailand)
cirB6: inversion of distal third of arm (Thailand)
cirB7: small subterminal inversion (Thailand)
cirB8: Small inversion of the region of the nucleolus (northern India)
cirB-F (called F2): involves the characteristic bands (groups 24-26) of arm B, to about F19 (Thailand)
cirC1: Median nucleolus (widespread)
cirC2: Inversion of about a third of the arm distal to the nucleolus (widespread)
cirD1: differs from oppD1 by at least one inversion (widespread)
cirD2: inversion of approximately the middle third of the arm (widespread)
cirD3: noted by Kumar & Gupta, but seems to be in same region as cirD2 (India)
cirE1: 1 - 2 4 - 10ab 3e-a, 3f, 10c - 13 from aprilinus by Inv4-3a
cirF1: 1 - 2a, 10d - 2c, 15c - 11a, 2b, 15d - 23 as oppositus F3
cirG1: Nucleolus near one end, three BRs towards the other end (most distal not always visible) (widespread)
cirG2: Inversion of over two thirds of the arm, from proximal of the nucleolus to between the two larger BRs (widespread)
cirG3: small inversion of the region of the BRs (India)
Polytene chromosome complement of C. circumdatus
BR - Balbiani ring; N - nucleolus; P - Puff.[ Return to Index| Go to C. circumdatus ]