Chironomus samoensis Tokunaga


Tokunaga's (1964) description of C. samoensis.
This seems the most reliable description of the adults.



C. samoensis: Male hypopygium (left) and superior appendage (right) (note boot, or shoe, shape)


Australian male specimens
AR about 2.4 - 2.9.
Frontal tubercles about 33 - 39 µm.
Palp proportions: 44 : 53 : 189 : 222 : 315

Wing length: 2.85 - 3.15 mm; wing width 0.30 - 0.67 mm.
VR about 0.95

Leg lengths (microns) 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

 

Bristles on 9th tergite: 9 - 12

Important features are the LR of about 1.8 - 2.0 (though known range: 1.6 - 1.8) and the relatively long anterior Ta5, which is about 0.35 - 0.4 length of anterior Ti.    In Australia, it is the only presently known species with a boot-shaped superior volsella.

Found: Northern Territory - Radon Creek, Kakadu National Park.
            Queensland - 3 km w. Sarina Beach.

            Originally described from Apia, Western Samoa.
            Also found in Micronesia and Japan.
            Indian specimens described by Chattopadhyuy et al. (1991), however, do not appear to be the same species,
            as the LR is reported as 1.4; the ant. Ta5 is only about 0.25 - 0.28 length of Ti, and the frontal tubercles are only about 18 - 25 micron.

This species can be bred in the laboratory, as fertile egg masses were obtained from adults reared from wild collected larvae.    Japanese specimens have also been maintained in a laboratory culture (Elbetieha & Kalthoff 1988).

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Modified: 2 November 2009
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Copyright © 2005-2009, Jon Martin.