Also known as grey silverfish, long-tailed silverfish or paper silverfish.

Microscopic examination required.  Large erect setae on the side of the body are saw-toothed. 

Found worldwide as a synanthrope in buildings.

All year. 

Uncommon, possibly increasing. 

Unknown.

https://www.fhi.no/globalassets/dokumenterfiler/rapporter/2019/long-tailed-silverfish-ctenolepisma-longicaudata---biology-and-control.pdf