Procloeon venustum

General appearance
Body length (ex. antennae & cerci) could reach to 9mm -- regarded as large species among baetids.
Cerci short slightly longer than half of abdominal length; dark marking medially with a feathery distal end (shown in mature larva)

Head
The details for mouthparts illustrated in the following pictures

Thorax
Hindwing pads well developed
Legs slender with long setae dorsally, villopore absent
Tarsal claws with two rows of denticles

Abdomen
Posterior marginal spines and lateral spines present on abdominal segments
Gills I-VI double - ventral gills asymmetrical & bluntly pointed with dorsal flap; Gill VII single
Gills well-tracheated and dorsal gills could not be clearly shown in early stages (see below images)
Distinctive dark band on tergum IX & posterior half of tergum VIII and triangular markings on terga II - VIII

 

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

Labrum

Mandibles

Maxillae

Labium

 

Distribution:
In Hong Kong, specimens are recorded from Sam A Shui Tsuen and Shek Mun Lap (Lantau Island), Bride's Pool and Wang Shan Keuk (Pat Sin Leng), Tai Po Kau Forest Stream, Ho Chung (Sai Kung).

Habitat: Larvae live in moderate water current streams.