Oriental Chironomus: C. fujisecundus Sasa

C. fujisecundus Sasa, 1985

Adult:

Male:
Wing length 2.54 (2.60-2.76) mm; squamal fringe with 17 (14-20) setae.  AR 3.23 (3.04 -3.40).
Coloration largely yellow or greenish yellow and partly brown; scutum yellow, stripes yellowish brown, scutellum yellow, postnotum brown; abdominal tergites entirely greenish yellow, hypopygium brown.
Thoracic setae - Acrostichal 17 (15-19); Dorsolateral 16 (12-18); Prealar 6-7; Scutellar 22 (18-28).
Legs with femur and tibia yellow but darkening to brown along the tarsi.  All tarsi with long setae, BR1 5.0 (4.0- 6.2); LR1 1.31 (1.25-1.35), LR2 0.55 (0.54-0.57), LR3 0.63 (0.61-0.67); Fore tarsus 0.23 (0.22-0.24) the length of the fore tibia.
Hypopygium as in figure below; The figure shows some indication of setae in individual pale areas on tergite IX.  Anal point long and narrow, slightly expanded at the tip.  Superior volsella closest to E(i)-type of Strenzke (1959); Inferior volsella almost globular.  Gonostylus with straight inner margin, widest at basal third and tapering towards the apex.

Male hypopygium and superior volsella of the holotype of C. fujisecundus
from National Museum of Nature and Science collection.

Female:
Wing length 2.86 mm. Coloration as male.
Frontal tubercles 8 µm long, 5 µm wide; 25 clypeal setae.
Thoracic setae - Acrostichal 25; Dorsolateral 14; Prealar 6; Scutellar 28.
LR1 1.35; LR2 0.54; LR3 0.61.

Pupa, Larva and Cytology: not known.

Found: Type locality - Japan: Lake Kawaguchi (35.59°N, 136.79°E) and Lake Yamanaka (35.42°N, 138.79°E), Yamanashi Prefecture.

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