Tuesday, December 21, 2010

12. Cercion malayanum (Selys, 1876)


Number: 12
Family: Coenagrionidae
Genus: Cercion
Species: Cercion malayanum (syn. Paracercion malayanum)
Common name(s): Malay Lilysquatter
Thai name(s): แมลงปอเข็มบางมลายู
Habitat: Exposed lowland and upland areas, near ponds/lakes
Province(s) sighted: Widespread (Khon Kaen); Khao Soi Dao (Chantaburi)
Sightings (by me): Uncommon (especially females)
In flight (that I have seen): March-December

Another small blue damselfly that I have seen on few occasions is Cercion malayanum (also called Paracercion malayanum). At first I was very confused with this species and Psuedagrion microcephalum. There are a number of differences, but the easiest way to distinguish the two is the '8' mark on segment 2 (see picture 2). C. malayanum is also smaller.
 
The male
The male is easy to spot with its bright azure blue and black colouration to the thorax and abdomen. The eyes are particularly stunning. 
 


 


The young male
The young male has the same markings as the adult, but the colour hasn't yet fully developed. 
 
 


The female
I saw the female for the first time two weeks ago (Dec 11 2010) and I was really happy to see it. The female is much duller in comparison with olive green colouration to the thorax with a feint orange stripe. I recently saw a second female in Khon Kaen (March 13 2012).
 

 
Female close up
 
Early morning exercise ...




 
The mature female
Until recently I thought that the female was only green. Now I have just spotted my first female that has blue flanks along the thorax and abdomen. She also has lots of parasites on the underside of her abdomen. Looks like she's just scooped up a load of caviar ...
 
 
 
 

I have seen this species between March-December in Khon Kaen, as well as once at Chantaburi.