Quick question on bugs, what is this?

[Sara_in_philly]

Just found a spot in my vegetable bed is infested with this, they are cased in the soil. What are they? Harmful to plants?
They are very small, about mung bean size.

[marknmt]

Look at this page and see if these examples are the same thing:

https://duckduckgo.com/?q=roly-poly+bug&t=lm&ia=web

and especially:

Armadillidiidae

[Sara_in_philly]

Thanks, Mark! I think this is it, the role poly bug. They are actually are good bug! I just killed lots of them.

[marknmt]

@Sara_in_philly

I just killed lots of them.

Don’t worry - there’ll be more.

[BobC]

Rollie Pollie

[Sara_in_philly]

You are right, Rollie pollie