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Bonjour,

On Sunday July 22/2012 morning, I shoot those Agelastica alni larva on Alnus cordata's leaf. And on one of these leaves I saw this scene :

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You can easily imagine on the second picture (see below) the raise of the larva : is it due to larvae's irritation from the sucking of the Chloropidae or is it some kind of deed seen in Coccinellidae's larva when they are pupating (sudden raise) ?

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far about 4 cm from the previous scene, I saw too this scene :

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Could the two eggs laid on Agelastica alni's larva be Chloropidae's one ?

Or should they be more obviously Tachinidae's eggs (or some kind of parasitic flies) ?



Thanks in advance !!!

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Here (http://www.olivie...010/07/23/) we have the same situation and some explanation. It is probably based on that text: http://www.zin.ru...00/16.html. I don't think that the big eggs belong to the Chrysomelids. Here (http://www.comman....alni.html) Tachinids as well as wasps are listed as possible parasites.

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Oh thank you very much, sundew !! :)


I'm glad to read that Olivier M. observed the same scene previously !!

I 'll contact him to know if he got some more informations !!!;)

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This evening, while hunting for Platypalpus, I observed the same! A few tiny Chloropidae were very active on and around the larvae of Agelastica alni. I caught one, my first Chloropidae I ever collected on purpose!!!!
What is the species?
The article mentioned in the other postings cannot be downloaded any more. I would like to have it. Can someone please send a copy to me?

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Ah, Thaumatomyia notata

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Really, the first scene shows an assemblage of Thaumatomyia notata (Meigen), Chloropidae [compare many comments on other pictures]. Pschorn-Walcher, H. (1956) Chloropiden als Kostgänger von Chrysomelidenlarven. – Zoologischer Anzeiger 156: 318-319, reported just the same observation and he mentioned a second species, Lasiosina albipila (Loew , 1866) feeding together with T. notata. In the 2nd scene several Lasiosina specimens (possibly also albipila) are present. The upper specimen seems to possess an extremely wide gena (= jowl), but surely a certain yellow background is the reason as albipila has a narrower gena. Worldwide several Chloropidae visit squeezed insects with stinking or poisonous hemolymph or exsudations, for example Tricimba, Trachysiphonella and Oscinimorpha spp., may be to become protected against predators. The 2 eggs do not belong to the two chloropid species, those possess smaller and narrower eggs.

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Thank you very much for this documented reply !!! :)