“Knieper” is lower German for “Kneifer” which is the noun for the verb “kneifen” (to nib oder to pinch).
I stumbled upon the crab per incident on the beach of Helgoland. They live in the Northern Atlantic and the North Sea. They are able to bring some water in their body to be able to “breath” when outside the water.
Although, I knew this species, I never met such a huge one before. It’s size was approximately of a DIN A4 sheet of paper (~30×21 cm). According to wikipedia, that’s nearly the maximum size.
He was still alive and I don’t know, why he left the ocean. Maybe, he was originally caught by a seal and then left alone. Who knows. I was glad about the finding.