Freshwater Macroinvertebrates in Hong Kong

Tholymis tillarga (Evening skimmer)

Habitat: larvae associated with submerged vegetation in ponds and marshes and are tolerant in brackish water conditions

General appearance: body relatively large sized, up to about 22mm long; head with small eyes and conspicuous large area of dark marking;; legs short, slender with conspicuous dark markings on femur; abdomen comparatively large, ovate shaped with dark median markings, especially noticeable black stripes on abdominal segment IX; dorsal spines on abdominal segments III - X and lateral spines on abdominal segements VIII - IX

Fullview
Head
Labium
Ventral view
Abdomen
Spine on S10