Firefly Larva and Courting Rhinoceros Beetles from Sumatra, Indonesia

bugman

February 20th, 2009 at 12:43 am

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“Glowworm” form Indonesia
Wed, Feb 18, 2009 at 3:02 AM
Hi!
During my recent holiday in Indonesia I saw some kind of bioluminescent bug (I guess it’s a beetle) on Sumatra, in the Bukittinggi region in the west.
The bug glowed continuously, without any blinking. After a few minutes it stopped, and would start up the light again when touched. It did not move very much, and only slowly, but maybe it was not in best health anymore. The guy from the hotel who lives in the area said he had seen it for the first time, so it can’t be too common.
I would guess it was about 6 cm in lenght. The picture on the following website shows a similar Insect, but unfortunately does not specify what it is: http://4to40.com/encyclopedia/index.asp?id=642

Firefly

As an extra I have attached a picture of two large beetles from the same area, which are very common in a riverbed and seem to feed exclusively on the bark of the many mimosa bushes there.
Cheers from Germany,
Till
Sumatra, Indonesia

Unknown Rhinoceros Beetles

Dear Till,
In our opinion, the glowing larva is an immature Firefly in the family Lampyridae, and not a Glowworm in the family Phengodidae. We love your photo of the courting pair of Rhinoceros Beetles. We have just spent about two hours updating and posting and researching answers, and we are a bit exhausted and need to stop now. We hope one of our faithful readers can provide a correct species name for your gorgeous Rhinoceros Beetles.

Update:
Hi!
With your information of the Genus I looked at some more pictures on the web, and found these for Xylotrupes gideon sumatrensis:
http://beetlespace.wz.cz/e_Xylotrupes_gideon_sumatrensis.html
That looks very close, I think.
Also, X. florensis seems to be restricted to Lesser Sunda and Tanimbar Islands, which Sumatra does not belong to.
Till

Thanks for the update Till. We can also provide a new link to the NaturalWorlds website that has a bit of information. The subspecies from Australia on the Brisbane Insects website has a much smaller horn structure.

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Comments 3

mardikavana wrote:
This is definetly a member of genus Xylotrupes. Maybe X. florensis or X. gilleti.
Posted 20 Feb 2009 at 2:12 am ¶
mardikavana wrote:
This is definitely a member of genus Xylotrupes. Maybe X. florensis or X. gilleti.
Posted 20 Feb 2009 at 2:12 am ¶
Till wrote:
Hi!
With your information of the Genus I looked at some more pictures on the web, and found these for Xylotrupes gideon sumatrensis:
http://beetlespace.wz.cz/e_Xylotrupes_gideon_sumatrensis.html
That looks very close, I think.
Also, X. florensis seems to be restricted to Lesser Sunda and Tanimbar Islands, which Sumatra does not belong to.
Posted 20 Feb 2009 at 6:47 am ¶

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