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Hello,

is someone here able to identify the genus?

I hope Stratiomyidae is correct.

Length 30 mm.
2016-05-05, northern Germany, garden, small pond

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I think this is the final instar of Oplodontha viridula for it seems as if there is a hairbrush at the ventral side of the head and the habitus and hairs on the body doesn't fit Odontomyia or Stratiomys.

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Great, many thanks.
I add a ventral picture of the head.

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I just came across a species account of O. viridula in an old field guide (1998) for flies, which says the length of the larvae would measure 14 to 17 mm - but mine was twice as long, 30 mm.
Now what is to say about that? Just an outdated information or is this probably not O. viridula but some other stratiomyid?

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You're right. Size matters. 30 mm is o.k. for Odontomyia ornata

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Great, I've never seen an adult of O. ornata. Thanks!