Is this long black insect with semi-long antennae and a large segmented abdomen caught in the kitchen a larva or an imago? And what is it?
That is an adult rove beetle (Coleptera, Staphilinidae). https://en.wikipedia.org/wiki/Rove_beetle 
Rove beetles have very short elytra (forewings), so they don't look like other beetles. This one looks a lot like Ocypus olens, which is common in Europe https://en.wikipedia.org/wiki/Devil%27s_coach_horse_beetle