Chironomus pallidinubeculosus Tokunaga, 1964

    Chironomus calipterus - misidentification in Bugledich et al. 1999.
    Chironomus kiiensis - incorrect synonymy by Hashimoto et al. 1981.

In BOLD Bin: BOLD:AEB0699

Note that the Australian specimens were raised from larvae in the laboratory at a temperature of 20C and so some measurements and ratios may be different from those of Tokunaga’s wild-caught adults.

Characterized by the patterned wings.  This pattern is very similar to that of the African species C. calipterus Kieffer, resulting in the Asian and Australo-Pacific material being synonymised with the African species.  However, comparison of polytene chromosomes from Israel indicated that the two species were distinct, with the Israeli, and presumably African, chromosome arm combination belonging to the thummi cytocomplex, unlike this species, which belongs to the pseudothummi-cytocomplex.  However, comparison of polytene chromosomes from Israel, indicated that the two species were distinct, with the Israeli, and presumably African, chromosome arm combination belonging to the thummi cytocomplex, unlike this species, which belongs to the pseudothummi-cytocomplex.
The wing pattern is also similar to that of C. striatipennis, but the adults of that species are darker, and they differ in mtCOI sequences.


Original description of C. pallidinubeculosus male from Tokunaga 1964

Male:
In details below, values for Australian specimens are followed by the range in Micronesia, given in brackets.


Male hypopygium of C. pallidinubeculosus (left) and superior appendage (right)

Wings with dark spot over the crossvein and with obvious dark clouds and seams, particularly in cell R5.  17-22 setae in squamal fringe, 2 Scf on branchiolum.  Haltere pale.
Wing length 2.44-2.82 (2.07-2.35) mm; width 0.60-0.68 (0.53-0.64) mm; VR 1.02-1.07 (1.04-1.09).


Face yellowish brown, antennae and palps brown.  AR about 3.00-3.13 (2.82-2.94).  Frontal tubercles quite large, about 15-56 µm long and 10-15 µm wide.  11-19 (16) clypeal setae.
Palps (micron): 45 (40): 48 (40): (136): 161 (136): 234 (200).Thorax yellowish green with brown stripes, lateral stripes darker along the medial edge, and ending in a darker spot; postnotum and sternopleuron brown.
Setae: acrostichals - 9-11; dorsocentrals - 9-11; prealar - 4-5; scutellar in two rows - 2-3 in anterior row, 6-9 in posterior row (total 8-12).
Legs yellow, femur with a dark band just before the knee; tarsal joints darkened.  LR 1.61 (1.59-1.630 (1.78-1.94).
Leg lengths (microns) and proportions as follows:

 
Fe
Ti
Ta1
Ta2
Ta3
Ta4
Ta5
LR
F/T
Ta5/Ti
PI
1000
915
1470
800
580
480
235
1.59-1.63
0.97-1.20
2.1-3.0
PII
1045
1050
600
353
265
190
138
0.52-0.63
0.98-1.0
-
PIII
1150
1285
985
600
447
273
173
0.75-0.80
0.91-0.93
-
AntTa5 about 0.26-0.30 (0.32) length of Ti.  About 7 sensilla chaetica on midTa1, and perhaps 5 on hindTa1.

Abdomen brown, no obvious bands on the segments.  5-6 (14) setae on TIX, probably in a single clear area.
Superior volsella essentially an E-type, perhaps closest to fig. h of Strenzke 1959, but end more sharply curved.
Inferior volsella reaching about to end of the anal point with some setae branched, in Micronesian specimens, this is noted as being unequal.
Style abruptly narrowing at distal third.

Female:


Original description of C. pallidinubeculosus female from Tokunaga 1964

Additional data from Paratype female:
Wing length 2.60 mm, width 0.73 mm, VR 0.89.  LR not available.
Antennal proportions (µm): 142 : 99 : 114 : 91 : 165.  Cephalic tubercles about 390 µm.
Palpal proportions (segs. 2-5) (µm): 40 : 136 : 136 : 170; P5/P4 1.25-1.38; P5/P3 1.38-1.75.   14 clypeal setae.
Thoracic setae: acrostichals - 14; dorsocentrals - abt 22; prealar - at least 2; scutellar in two rows – 5 in anterior row, 8 in posterior row.
2 Scf on branchiolum of wing.
Leg lengths (µm) and proportions as follows:

 
Fe
Ti
Ta1
Ta2
Ta3
Ta4
Ta5
LR
F/T
BR
PI
1040
860
-
-
-
-

-
1.21
-
PII
1060
1060
600
320
250
170
110
0.57
1.00
-
PIII
1220
1320
-
-
-
-
-
0.92
-
-

No information available for Australian specimens.

Found: Queensland - Noosaville (-26.398°S, 153.062°E).
Type locality: Micronesia - Ulimang, Babelthuap I., Palau Is. (Tokunaga 1964).

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Modified: 7 September 2023
Access: Unrestricted
Copyright © 2005-2023, Jon Martin.