Description
This butterfly was classified as very rare by the early authors, and described as "most often taken in Singapore at the edges of mangrove swamps". The butterfly is generally similar in appearance to the Malayan Sunbeam. However, the males are a deeper orange above, with narrower black borders, whilst the females are a paler orange, with broad black dusted borders on the fore- and hindwings.

The species has distinctive red banded legs. The underside post-discal striae are more lunulate and irregular when compared with the Malayan Sunbeam. Interestingly, Curetis saronis sumatrana is not rare in Singapore and can be occasionally seen in numbers at the Sungei Buloh Nature Reserve.

Habitat & Habits
The species is feed on a type of Derris trifoliata (Common/Sea Derris) in the nature reserve. It appears to be local in the park and any environmental degradation at the Sungei Buloh Wetland Reserve would almost certainly spell the doom of this butterfly in Singapore.

Other Observations
To be detailed.

Early Stages
Refer to this ButterflyCircle's blog article - The Life History of the Sumatran Sunbeam.

Further Reading
To be detailed.