Great Green Bush-cricket
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Tettigonia viridissima
Common & widespread around Britain.
Tettigonia viridissima is distinguished by its very long and thin antennae, which can sometimes reach up to three times the length of the body, thus differentiating them from grasshoppers, which always carry short antennae.
It could be confused with Tettigonia cantans, whose wings are a centimeter shorter than the ovipositor, or Tettigonia caudata, whose hind femurs bear conspicuous black spines.
The morphology of both sexes is very similar, but the Female has an egg-laying organ (ovipositor) that can reach a length of 23–32 millimetres (0.91–1.26 in).
It reaches the end of the elytra and is slightly curved downward.