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I am not sure if it is a larva of an Artrhopod, or maybe some kinde of worm or slug. I have definitely no idea what this could be.

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I had something similar (though not identical) and I think that developed into a curculionid.

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Hello!



Can you tell the host plant? I am no coleopterology expert, but that animal looks exactly like a larva of the weevil Stereonychus fraxini (Curculionidae, as Paul already wrote) which is very abundant here in Germany on ash (Fraxinus excelsior). That does not exclude similar looking larvae of other Curculionidae, anyway...

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Unfortunately I can not. Remeber this image is from Japan and I do not know the local flora, which is vastly more diverse that the one in Central Europe. The only thing I remember is that it was not a tree, it was a much smaller plant.

Xespok