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lemon yellow fly - small
Cor Zonneveld	#1 Posted on 07-07-2007 16:48
Member Location: Amstelveen, the Netherlands Posts: 840 Joined: 14.10.06	I saw this smalle yellow fly first time today - in numbers. First one in bramble bush, then 10 on a wooden pole in the Amsterdamse Bos (nutrient rich, on clay, quite wet), then 1 in my garden! Is is small, 2 - 3 mm. It hoovers slowly and if so you see a lemon pinhead moving. What can it be? And what is this strange structure on the tip of the abdomen? I've seen it in at least two specimens, so it is unlikely to be teratogenic. Cor Zonneveld attached the following image: [121.23Kb] Thanks for your attention Cor Zonneveld


Kahis	#2 Posted on 07-07-2007 17:57
Member Location: Helsinki, Finland Posts: 1999 Joined: 02.09.04	It's a Thaumatomyia (Chloropidae) Kahis


Cor Zonneveld	#3 Posted on 07-07-2007 18:06
Member Location: Amstelveen, the Netherlands Posts: 840 Joined: 14.10.06	Thanks! And the yellow grapes at the tip of the abdomen? Thanks for your attention Cor Zonneveld


Kahis	#4 Posted on 07-07-2007 19:02
Member Location: Helsinki, Finland Posts: 1999 Joined: 02.09.04	No idea whatsoever. Kahis


Juergen Peters	#5 Posted on 07-07-2007 19:07
Member Location: northwest Germany Posts: 13660 Joined: 11.09.04	Cor Zonneveld wrote: And the yellow grapes at the tip of the abdomen? Perhaps eggs? (Although quite large.) Best regards, Jürgen -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Juergen Peters Borgholzhausen, Germany WWW: http://insektenfo... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


Eric Fisher	#6 Posted on 08-07-2007 15:12
Member Location: California Posts: 435 Joined: 19.05.06	Thaumatomyia are egg parasites. Probably those are eggs - of some other insect - and the Thaumatomyia is just doing its job. Cheers, Eric.


Tony Irwin	#7 Posted on 08-07-2007 15:51
Member Location: Norwich, England Posts: 7193 Joined: 19.11.04	Eric Fisher wrote: Thaumatomyia are egg parasites. Probably those are eggs - of some other insect - and the Thaumatomyia is just doing its job. I don't think so . Thaumatomyia notata larvae are predators of root aphids, and I haven't heard of other species as egg parasites. In any case this little bundle of eggs would not be enough to sustain a Thaumatomyia larva. I suspect that these are its own eggs, perhaps laid under stress? Tony ---------- Tony Irwin


Cor Zonneveld	#8 Posted on 09-07-2007 19:53
Member Location: Amstelveen, the Netherlands Posts: 840 Joined: 14.10.06	I agree with Juergen that IF they are eggs, and this is still a big if, they are LARGE. This suggests low numbers and high larval survival. Is that likely for such tiny flies? Also, if they are eggs, it suggests some form of brood care - rather unexpected. perhaps laid under stress Doubtful, since I saw it twice on one day in different places. And my photography is quite harmless Thanks for your attention Cor Zonneveld


Ben Hamers	#9 Posted on 09-07-2007 21:57
Member Location: Heerlen ( Holland ) Posts: 735 Joined: 16.12.04	This picture I made in April. It seems as if position, number and size of the unknown objects are the same as on Cor's fly. Ben Ben Hamers attached the following image: [57.98Kb] Edited by Ben Hamers on 21-05-2012 19:27