|Vestalis is a genus of damselflies
belonging to the family Calopterygidae. The genus contains around 16 species.
Vestalis amoena (Hagen in Selys,
1853) occurs throughout lowland Borneo, up to about 500 m, and elsewhere
The species has a metallic green
body with long thin legs and is characterized by the transparent wings
with a sparkling bluish purple iridescence. Males and females look alike.
In males, the hindwing is 32 to 35 mm long and the total body length ranges
from 49 to 55 mm. The male looks almost identical to Vestalis amethystina
except for minute differences in the male anal appendages. Females of Vestalis
amoena are almost identical to those of Vestalis amethystina. The
female Vestalis amethystina can be separated from the female Vestalis amoena
only by the colour of the labium. In Vestalis amethystina, it is largely
black. In Vestalis amoena, it is mainly yellow.
It is common on larger forest streams
and is the most wide-spread of six very similar species, all with a metallic-green
head, thorax and abdomen, and clear wings reflecting purplish or greenish
iridescence from certain angles. In all species mating is preceded by courtship
in which the male dances around the female displaying the sparkling colors
of his wings. Females oviposit in dead leaves around the margins of streams,
either guarded by the male or alone. The larvae of amoena are found among
leaves and pebbles at the edge of fast flowing water. The other five species
are distinguished from amoena and each other mainly by the form of the
male appendages. They differ also in distribution and ecology.
The species is native to Brunei;
Indonesia; Malaysia; Singapore; Thailand, It is a widely distributed and
common species, capable of surviving in disturbed forest habitats, and
is therefore assessed by IUCN Red List as Least Concern.