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 short, about 440-530 µm long and 140-250 µm wide.
Gula darkened over most of length, widest about midpoint (Fig. 14, below).
Width between antennal bases about the same as that between the S4 setae.
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 longer than wide.
Mandible about 310-350 µm long, third inner tooth apparently darkened and well developed (Ty. 3c).

Larva of C. sinicus (Kiknadze et al. 2005)

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.

Karyotype of C. sinicus from Kiknadze et al. 2005

Found: CHINA - Nankai University campus, Tianjin City.Type locality
Holotype male (BDN #21352); paratypes 3 males, as holotype.

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

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