Labiobaetis diffundus
General appearance
Body size small medium up to about 5mm long (excluding antennae & cerci)
Body cylinderical & elongated, frontal ridge on head between antennae
Head
Antennal scape with a distinct lobe at distolateral margin
Terminal segment of maxillary palpus with a distinct concave near apex
The details for mouthparts
illustrated in the following pictures
Thorax
Hindwing pad absent
No villiopore on femora
Legs pale without marking
The details for each leg illustrated in the following pictures
Abdomen
6 pairs of gills II - VII, single, tracheated but poorly seen
Central filament is not reduced -- 3 caudal filaments are shown clearly; cerci length is slightly longer 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 Shing Mun, Tai Po Kau Forest Stream, Hatton Road (nr. University of Hong Kong).
Reference:
Shi, W. & Tong, X. (2014) The genus Labiobaetis (Ephemeroptera: Baetidae) in China, with description of a new species Zootaxa 3815(3): 397-408.