What does the One Spot Grass Yellow butterfly look like?

Eurema andersonii is a small to medium butterfly with bright yellow upperwings and a pale yellow underside. Its defining feature is a single, clearly defined black spot on the underside of the hindwing. Both sexes look similar, though females may have slightly heavier wing-margin markings.

Where can I see Eurema andersonii in Sri Lanka?

Look for this butterfly in open grasslands, scrublands, paddy-field margins, and roadsides across the lowlands and mid-country. Protected areas with open habitats, such as the surrounds of Udawalawe National Park and the edges of the Sinharaja Forest Reserve, are reliable locations. It is generally absent from dense high-altitude forest.

Is the One Spot Grass Yellow common in Sri Lanka?

Yes, it is considered a common resident species across much of the island's lowland zone. It tolerates disturbed and cultivated habitats well, which helps it maintain stable populations even where natural vegetation has been reduced.

What plants do One Spot Grass Yellow caterpillars eat?

The larvae feed on plants in the legume family Fabaceae. Several native and introduced leguminous shrubs and trees, including Pongamia pinnata, serve as host plants across the species' range in Sri Lanka and South Asia.

How is Eurema andersonii different from other Eurema species in Sri Lanka?

Sri Lanka hosts several Eurema species, many of which look superficially similar. The single distinct black spot on the hindwing underside is the clearest field mark separating E. andersonii from close relatives. Comparing the presence, number, and position of spots on the underside is the most reliable way to confirm identification.

What does Eurema andersonii feed on as an adult?

Adult One Spot Grass Yellow butterflies are nectar feeders, visiting a wide range of small wildflowers close to ground level. They also visit damp soil and puddles to obtain salts and minerals, a behaviour known as mud-puddling that is especially common in males.

What family does Eurema andersonii belong to?

It belongs to the family Pieridae, the group commonly called whites and yellows. This large butterfly family includes familiar species such as the cabbage white and various sulfurs. Within Pieridae, Eurema andersonii sits in the subfamily Coliadinae.

One Spot Grass Yellow (Eurema andersonii)

The One Spot Grass Yellow (Eurema andersonii) is a butterfly species belonging to the Pieridae family, which includes the "whites" and "yellows." This species is found in Sri Lanka, India, and Southeast Asia, primarily in grassy and open habitats.