Armadillidium ID help needed

[DerGraf]

I got a small number of Armadillidium isopods a short while back, which I thought were the common Armadillidium vulgare. But I found another animal last weekend, which made me question this assumption. Lo and behold it seems the suspicion was well founded! The species I already had isn't able to fully "roll up", which is a traitmark of vulgare.



So the question now is: What species do I have here actually? Origin of this animal is north-west Germany, from an area dispersed with wetlands, grass fields and small forest sections.

The markings look too yellow for Armadillidium nasatum.

I could imagine Armadillidium depressum. The outer appearance fits, but I'm not sure how to be verify that species. Usually my region isn't noted as a habitat, but it certainly isn't far away from where this species can commonly be found and it's cosmopolitan enough that I could easily see it being found here.

There are species I think are unlikely, but I can't fully rule out, like Armadillidium opacum and Armadilliudium pictum. I've read those can fully roll up, but I wasn't able to find trustworthy picture references for that.

Also, maybe I simply overlook some species, which I don't know can be found in my area.

 

[Armadillidium king]

I got a small number of Armadillidium isopods a short while back, which I thought were the common Armadillidium vulgare. But I found another animal last weekend, which made me question this assumption. Lo and behold it seems the suspicion was well founded! The species I already had isn't able to fully "roll up", which is a traitmark of vulgare.

View attachment 453370 View attachment 453369

So the question now is: What species do I have here actually? Origin of this animal is north-west Germany, from an area dispersed with wetlands, grass fields and small forest sections.

The markings look too yellow for Armadillidium nasatum.

I could imagine Armadillidium depressum. The outer appearance fits, but I'm not sure how to be verify that species. Usually my region isn't noted as a habitat, but it certainly isn't far away from where this species can commonly be found and it's cosmopolitan enough that I could easily see it being found here.

There are species I think are unlikely, but I can't fully rule out, like Armadillidium opacum and Armadilliudium pictum. I've read those can fully roll up, but I wasn't able to find trustworthy picture references for that.

Also, maybe I simply overlook some species, which I don't know can be found in my area.

that's a Armadillidium vulgare some have a problem causing them to not fully roll up and some just prefer not to

 

[Armadillidium king]

also, Armadillidium nasatum have a snout that sticks out so that's not it.
and if you can't even identify an isopod correctly you don't belong in the isopod hobby

 

[Armadillidium king]

and correct me if I'm wrong the isopod in the photo is the one you need identified, correct?
if not send a picture of the isopod you need identified

 

[DerGraf]

Yes, it is. Your answer is the best I've got until now, so I'm working under that assumption.
The individual in the picture has passed by now but I have a bunch of babies. I'll see, once they are bigger, if they show proper A. vulgare rolling behaviour, to verify the assumption.

 

[Armadillidium king]

none conglobating isopods can't even roll up that much, so it has to be a Roly poly. if you look at its tail you can see it is flat at the middle point and the 2 edges are pointy which means their Armadillidium vulgare
here look at the difference of nasatum and vulgare


Armadillidium nasatum / vulgare - Armadillidium vulgare - BugGuide.Net

 

[Armadillidium king]

also, why would you say he ii not fully rolled up he looks rolled up to me.