Compsoneuria taipokauensis

General appearance
Body color light yellow to yellowish brown; size small medium up to 6mm long (excluding antennae & cerci)
Three cerci much longer than body length by 2 times

Head
Diffuse pale smudges on anterior margin of head (cf. concrete spots in Afronurus sinensis)
The details for mouthparts illustrated in the following pictures

Abdomen
Gills I - VII well tracheated; all gills with fibrilliform portion except gill VII
Dark markings on each terga, conspicuously shown on terga VI, VII & X

 

Its mouthparts of labrum, mandibles, maxillae and labium are illustrated as follow (hypopharynx is excluded).

Labrum

Maxillae

Mandibles

Labium

 

Distribution:
Specimens are recorded from Tai Po Kau Forest Stream in Hong Kong.

Reference: Tong, X. & Dudgeon, D. (2003). Two new species of Heptageniidae from China (Insecta, Ephemeroptera). Acta Zootaxonomia Sinica 28: 469-473.