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I found those wriggling in the little pond accumulated in the leaf axils of Teasel (Dipsacus fullonum) . I think they are diptera larvae, burt are they ? And if so, is it a typical habitat, and for which species ?
Thanks in advance for your replies
Philippe

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Ceratopogonidae,
Dasyhelea sp. (puparia)

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In Britain, Dasyhelea dufouri (= bilineata) is the species normally found in teasel axils. You should be able to rear adults from these pupae quite easily.

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Thanks, that was my idea ( to rear hem, not the ID, I hadn't a clue) . I just checked the plants, just after a second shower, and all the pupae seem to have hatched - all of them except a few that look moribund and a few dead adults that presumably got drowned when the shower came ! I'll have to hope for a second crop...