"Chironomus flaviplumus"

            This species is related to C. flaviplumus in Japan, but a new name is needed for this species (Martin 2011b), so C. orientalis is suggested.

In Bold bin: BOLD:AAV5954.

Adults:


Adult from Queensland (photo by Graeme V. Cocks)

Males:

C. flaviplumus type 3: Male hypopygium (left) and superior volsella (right) (note beaked shape)

AR about 2.4 - 2.9 (Specimens from Japan have an AR of 3.5-4.0, and probably should be considered as C. flaviplumus - see also under "Cytology")
Frontal tubercles about 33 - 39 µm, and about 3 times longer than wide.
Palp proportions (micron): 44 : 53 : 189 : 222 : 315
Wing length: 2.85 - 3.15 mm; wing width 0.30 - 0.67 mm.  VR about 1.02-1.07; abt 2-4 SCf on brachiolum; 9-14 setae in squamal fringe.
Thoracic setae - achrostichal about 12-18; dorsocentral about 13-18; prealar about 4-6; supra alar 1; scutellar in 2 approximate rows, 6-7 in anterior row, 11-17 in posterior row.

Legs pale, lengths (micron) and proportions as follows:


 

Fe

Ti

Ta1

Ta2

Ta3

PI

1350

975

1820

925

837

PII

1305

1155

750

393

268

PIII

1478

1385

1180

595

448

 

Ta4

Ta5

LR

F/T

BR

PI

712

362

1.82-1.96

1.35-1.44

1.7-2.2

PII

168

125

0.62-0.67

1.11-1.17

 

PIII

262

152

0.81-0.92

1.05-1.09

 

Abdomen pale (greenish) with a relatively broad brown band about the middle of segments II-V, then covering most of the following segments.
The superior volsella is essentially a D(e)-type of Strenzke (1959), although often of a beaked type not illustrated by Strenzke (1959), i.e. it varies between a D- and an almost S-type.
Setae on 9th tergite: 9 - 12; some setae on inferior volsellae with a simple or trifid fork; gonostylus reduces fairly quickly over posterior half.

Female:
Wing length 3.28 - 3.53 mm; width at cross vein 0.83 - 0.90 mm, VR 1.08-1.21.$nbsp;$nbsp;About 2-4 SCf on brachiolum; 17-22 setae in squamal fringe.
Head with frontal tubercles about 14 Ám long and 13 Ám wide; about 27 - 55 clypeal setae.
Antennal segments (microns): 190 : 127 : 147 : 121 : 215.$nbsp;$nbsp;AR about 0.36; A5/A1 about 1.13.
Thoracic setae - acrostichal about 13-17; dorsolateral about 32-44; prealar about5; supra alar 1; scutellar in two approximate rows, 5 in anterior row; 11 in posterior row.

Leg proportions (micron)


 

Fe

Ti

Ta1

Ta2

Ta3

PI

1664

1196

2290

1255

1189

PII

1588

1410

845

452

313

PIII

1727

1663

1338

706

557

 

Ta4

Ta5

LR

F/T

BR

PI

1189

405

1.91-1.92

1.37-1.42

1.44-1.82

PII

196

152

0.58-0.61

1.11-1.14

-

PIII

317

190

0.79-0.82

1.02-1.06

-


ant Ta4/Ti about 0.98; Ta3 and Ta4 subequal in length.

Abdomen pale (probably greenish); about 4 setae on gonopophysis VIII.

Differences from other members of the C. samoensis/flaviplumus group:
Important features of males are the AR of 2.4-2.9 (lower than that of C. flaviplumus, but similar to C. samoensis), LR of about 1.8 - 2.0 and fore Ta5, which is about 0.35 - 0.4 length of Ti.  In Australia, it is the only presently known species with a beaked superior volsella.
In the female the fore legs are very long, with LR about 1.9, and Ta3 and Ta4 are about equal in length, only a little shorter than Ta2, ratio Ta4/Ti about 0.98
See here for descriptions of C. samoensis Edwards.
The Australian species is probably most closely related to the Japanese C. flaviplumus Tokunaga.

Molecular Sequence:
CO1 - GenBank accession nos. for Chinese specimens are KP902730 & -31. and for Thailand KT213029-038.  In BOLD they have 99.5% similarity to an early release sequence named as ChironomidaeGC sp. 7 from Queensland, Australia.

Found: Northern Territory - Radon Creek, Kakadu National Park; (12.75°S, 132.93°E); Twin Falls, off Jim Jim Road, Kakadu area
            (13.00°S, 132.58°E).
            Queensland - 3 km w. Sarina Beach (21.40°S, 149.25°E).
            The species is also widespread in the Orient.

Indian specimens described by Chattopadhyuy et al. (1991), are not the same species and one has been renamed C. indiaensis (Martin 2011b), while others are the widespread species PK2.

Australian adults of this species can be bred in the laboratory, as fertile egg masses were obtained from adults reared from wild collected larvae.  The related Japanese species has also been maintained in a laboratory culture (Elbetieha & Kalthoff 1988).

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Modified: 24 May 2018
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Copyright © 2005-2018, Jon Martin.