Two Spotted Line Blue
An unidentified lycaenid "blue" was recorded sometime in Jan 2004 by one of our members in ButterflyCircle, no one has any idea what it was , as it did not match any of the
Nacaduba species recorded in books of butterflies of the South East Asian Region, so we thought it could be an aberration of one of our local nacaduba species and filed it under our Unidentfied Flying Object (UFO) folder.
Two similar looking BFs were again shot in Feb 2005 and Nov 2006 at 2 separate locations miles apart , we had to conclude that it could not possibily be a 2nd and 3rd aberration of a local species that bear identical marking. Internet searches found an Australian species of Nacaduba known as the Two Spotted Line Blue (
Nacaduba biocellata) and the descriptions from several Australian websites, matched the UFO that we found in Singapore.
Finally a small colony was found in Northern Singapore in early 2008, proving that it was not a wayward migrant or a one-off stowaway species that somehow landed in Singapore. We managed to do a proper recording of the species and positively identified it as the Nacaduba biocellata. How it was able to 'migrate' this far from Australia is anybody's guess. But it is likely that human agency is involved, rather than natural migration.
The species is described as common and sometimes abundant in Australia, where its host plants are various species of Acacia. In Singapore, where the invasive
Acacia auriculiformis - Earleaf Acacia, or the Northern Black Wattle or the Australian Wattle, grow wild, it is likely that the Two Spotted Line Blue has also adapted to feed on this species of Acacia. Indeed, at the location where this colony was found, there are a few Acacia trees nearby and the butterflies were seen to and fro tree at times.
As recent as Sept 08 the species continue to be spotted at the location we found them. Just like the multi-racial populace of Singapore which comprises of descendants of immigrants , we just have another "immigrant" that turned "permant resident" in the Singapore Butterfly Checklist. We hope it will stay and become another "citizen".
Here is a shot of this tiny butterfly which is about 1.7 cm from head to tail:
Two Spotted Line Blue (Nacaduba biocellata)
ISO320 1/30s F/11 , Fill-flashed , monopod.
Canon 40D +Tamron 180mm +580EX II
Cheers!