Dragonflies of Nee Soon swamp forest 
141 
Fig. 11. Plot results of the ordinary linear square test on environmental variables PCI to species 
Richness (R), with slope at -0.79, intercept 5.79. 
[Central Catchment Nature Reserve, including Nee Soon freshwater swamp forest] 
in Singapore and the genus is not known from Bukit Timah.” “ Prodasineura collaris 
is widely scattered and appears associated with still waters choked with leaves. 
Prodasineura notostima is common over deeply-shaded open streams. Prodasineura 
interrupta occurred together with P. notostigma in the lower part of Nee Soon Swamp 
Forest and was widespread in the upper Nee Soon basin where it was the only species 
seen. It remains unexplained why this species is, on present evidence, confined to the 
Nee Soon catchment, since it is found in riparian galleries not obviously different from 
those in other drainage systems. The absence of P. notostigma from the upper Nee 
Soon basin is also remarkable.” Two decades later, we found that the genus has spread 
beyond the Central Catchment Nature Reserve. Prodasineura notostigma has been 
commonly found in forest streams in Bukit Timah and other nature areas in Singapore. 
However, statements for Prodasineura collaris and P interrupta remain valid except 
that the latter species is no longer the only species found in the upper Nee Soon basin. 
Prodasineura notostigma has become the dominant species there. The restriction of 
Prodasineura interrupta to Nee Soon freshwater swamp forest is probably related 
