Cloeon harveyi

General appearance
Body size medium-small up to 6mm long (excluding antennae & cerci)
Body yellowish brown with distinct brown markings throughout the body

Head
Antennae long about 3 times of head length; scapes and pedicles with reddish brown markings distally

Thorax
Hindwing pads and villiopore absent
Legs uniformly light yellow, femora with brown band sub-distally
Tarsal claws elongated approximately 0.6x length of tarsi with 2 rows of small denticles

Abdomen
7 pairs of gills I - VII: gills I - VI double lamellae and well tracheated; gill VII single and smaller
Abdominal terga yellowish brown with a pair of pale spots; unique reddish brown markings on segments II - III and V - VI
Cerci about half of body length fringed with fine long setae on both lateral side; dark brown annulation every fourth segments

 

Distribution:
In Hong Kong, specimens are recorded from Pui O and Ling Yan Temple (Lantau Island), Cheung Sheung and Ham Tin (Sai Kung), Nam Chung River.

Habitat: Unlike other baetids, larvae could be found in standing freshwater e.g. ponds.

References:
Tushar Kanti Mukherjee (2012) Contribution to the Knowledge of Procloeon harveyi Kimmins (Insecta: Ephemeroptera): Morphology and Ecology J. Entomol. Res. Soc., 14(3): 55-66.

Remarks:
Cloeon is diversified genus of Baetidae. Its identification remains unclear, interchangable with Procloeon in Afrotropical and Oriental regions. The proportion of the hind tarsi of the imago was used to separate the two genera, but again this character seems subject to caution (Mukherjee, 2012).