Chopralla fusina

General appearance
Body size small up to about 4mm long (excluding antennae & cerci)
Abdomen dorso-ventrally flattened to give a stout impression (cf. an elongated body shape of Labiobaetis)

Head
The details for mouthparts illustrated in the following pictures

Thorax
No villiopore on femora
Presence of a row of long setae along tibiae & a transverse row of long setae across tibiaea
Claw with two rows of 3 denticles (cf. no denticle in Cloeodes longisetosus)
Dark brown marking on dorsum of fermora submedially, on tibiae & tarsi proximally (see the picture below)

Abdomen
Gills I - VII single, tracheated, a pale coloration on tergum VIII
Terminal filament is not reduced -- 3 caudal filaments are shown clearly; cerci length is about less than half of body length

Legs

 

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

Labrum

Maxillae

Mandibles

Labium

 

Distribution:
In Hong Kong, specimens are recorded from Sam A Shui Tsuen (Lantau Island), Shing Mun, Lam Tsuen River, Pak Tam Chung, Tai Shui Hang (Ma On Shan).

Reference:
Tong, X. & Dudgeon, D. (2003) First record of the genus Chopralla (Ephemeroptera, Baetidae) from China, and description of a new species. Raffles’ Bulletin of Zoology 51: 17-19.