We used to have lots of cylindrical brown millipedes but these days, they are replaced by this particular species. Even my houseplants have them, partly because I bought plants grown in soil from the same source.
I know they don't really do harm to plants and in fact helps to cycle plant wastes into the soil, but I freak out every time I see this type of millipede and would never fail to scoop the curled up millipede from the soil and throw it out. I mean, I always see mating pairs wriggling in the soil, and I cannot imagine all my plants covered with this creepy crawlie, so I had to do something to curb its proliferation. Until someday I overcome this obsessive behaviour to get rid of them, I won't be able to live with their presence. Anyway, a link is attached below: