Oriental Chironomus: C. sinicus

Chironomus sinicus Kiknadze et al. 2005.

Adult

Male: Length 8.64-9.67 mm.
Wing length 4.43-5.03 mm; VR 1.03-1.06.  Squama with 13-21 setae.
AR 4.79-5.31.  Frontal tubercles well developed, 52-83 µm long.
Relative length of palps (in µm) 66 : 82 : 244 : 232 : 298.  Clypeus with 31-39 setae.Thoracic setae: 16-19 dorsocentral, 9-14 acrostichials; 6-7 prealars, 35-42 scutellars.
Legs: Front tarsi bearded, BR 5.95-6.23.  Leg ratios omitted from published description, but inserted below:
Lengths (in mm) and proportions of legs:

Pupa:Length 12.0-12.5 mm, wing sheath length 2.8-3.0 mm. Cephalic tubercles 220-250 µm high and 120-150 µm wide.Thoracic granulation well developed anteriorly. Pleura of segment IV smooth. Hook row of tergite II with 90-125 hooks and occupying 0.59-0.63 of total segment width. Caudolateral spur of segment VIII with 10-14 spines. Shagreen present on sternites III and IV and forms a longitudinal band on each side.

Fourth instar larva of the melanotus (semireductus)-type, length 17-22 mm. VT 0.82-1.25 mm (ant) and 0.75-0.98 mm (post), posterior pair curved anteriorly. Lateral tubules about 160-238 µm long. Anal tubules about 440-530 µm long and 140-250 µm wide.
Ventromentum with about 79-83 striae. PE with about 12-17 teeth.
AR 1.55-2.28; antennal proportions (µm) 144 : 34 : 15 : 16 : 10 ; basal segment about 2.9-3.2 times as long as wide.
Mandible about 310-350 µm, third inner tooth apparently darkened and well developed.

Cytology: Four polytene chromosomes with the thummi-cytocomplex combination: AB, CD, EF, G. Only nucleolus subterminal on arm G.
Polymorphism in arms C and G. Additional B-chromosomes present in over a third of larvae examined.

sinA1:  1a - 2c, 10 - 12, 3 - 2h, 4d - 9, 2d-g, 4c-a, 13 - 19 as plumosus A1
sinB1:  Puff towards the distal end of the arm
sinC1:  1a-c, 12 - 11d, 6gh, 17a-16, 7d-a, 6f-c, 2c-1d, 13-15, 8-11c, 6b-2d, 17b-22
sinC2:  1a-c, 12 -11d, 6gh, 17a-16, 7d-a, 6f-c, 2c-1d, 13-15, 8-11c, 6b-4g, 18d-17b, 2d-4f, 18e-22
sinD1:  1 - 2g, 13a, 10a-8, 18d-a, 7-4, 10e-b, 13b-14, 3-2h, 12 - 11, 15 - 17, 18e-24
sinE1:  1 - 3e, 5 - 10b, 4 - 3f, 10c - 13 as plumosus E1
alternative E1; 1 - 3a, 4c-10b, 3e-b, 4b - 3f, 10c - 13
sinF1:  1a-d, 6e - 5d, 10d - 7a, 5c - 1e, 14f - 17, 14e - 11, 18 - 23
sinG1 and sinG2 differ by a small inversion near the distal BR.

Found: Type locality - Nankai University campus, Tianjin City, CHINA.

Cytology described by Kiknadze et al. (2005) as part of the original description.

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