Possibly a mayfly, possibly of the family Ephemeridae, which can grow to 35 mm.
2.
In the much younger Baltic amber numerous inclusions of several modern families of mayflies have been found ( Ephemeridae, Potamanthidae, Leptophlebiidae, Ametropodidae, Siphlonuridae, Isonychiidae, Heptageniidae, and Ephemerellidae ).
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