
Nalassus laevioctostriatus - Larva
Found this larva under a stone in an area where Nalassus laevioctostriatus is abundant. Just took the two images, but going by what is visible on the photo and some keys to the larvae that I found, as well as ruling out some options of species that don't occur in area (or even country), it should be safe to ID this as N.l.

Nalassus laevioctostriatus (Goeze, 1777) is a common and widely distributed darkling beetle throughout large parts of Central Europe. In suitable habitats it can be quite abundant. The adult beetles are active at night and can often be found in large numbers grazing algae on tree trunks.