South East Asian Chironomus: C. tusimaabeus

Chironomus tusimaabeus Sasa & Suzuki 1999

Adult
Known only from the adult.

Male:

Hypopygium and superior volsella of C. tusimaabeus from Sasa & Suzuki 1999

Body length 8.98-9.41 mm; wing length 4.48 (4.16-4.84) mm, width 1.21 (1.12-1.31) mm, VR 1.07 (1.04-1.09)
Body uniformly black or dark brown, abdominal tergites slightly paler along caudal margin.  Setae on scutellum and abdomen arising from pale pits.
Head: Antenna with 11 flagellar segments, AR 3.96 (3.80-4.11).  Frontal tubercles prominent 54 µm long and about 3.5 times longer than wide.  Palp 5 segmented, segment I with a seta, other segments with numerous setae; 45 (34-56) clypeal setae.
Thoracic setae: 20.7 (16-26) acrostichal; 34.8 (34-36) dorsocentral; 7.3 (7-8) prealar; 39 (37-41) scutellar in two rows.
LR1 1.48 (1.43-1.54); LR2 0.59 (0.58-0.62); LR3 0.74 (0.70-0.80); BR 3.8 (3.2-4.4), i.e. short beard.
No indication of setae on TIX.  Hypopygium with anal point extremely and unusually wide and sickle-shaped in lateral view; Superior vosella possibly E-type (h) of Strenzke (1959);  Inferior Volsella reaching about to tip of anal point and a third along the gonostylus, with 18 simple recurved setae.  Gonostylus moderately swollen and sharply constricted over distal third and with 6 setae at distal end.

Female, pupa, larva and cytology unknown.

Found: Type locality - Kechi Dam, Mitsushima, and Nita Dam, Kamiagata, both Tsushima Island, Nagasaki Prefecture, Kyushu, Japan. [Holotype: male, 355:018 (NSMT-I-Dip 5166); paratypes: males, No. 355:95, 374:57].

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