Found this mijne in my garden on aquilegia.
Which (moth?) could have made it?
Found in northern Germany.
It was probably a fly(diptera).
Maybe this one http://www.bladmineerders.nl/minersf/dipteramin/phytomyza/minuscula/minuscula.htm (http://www.bladmineerders.nl/minersf/dipteramin/phytomyza/minuscula/minuscula.htm)