Common Rock Louse

Thanks loarie. I will add it later after I finish adding some photos from a bioblitz I went to

age difference. If you click on 'View more' you can see more examples:
https://www.inaturalist.org/taxa/84264-L...
which include some big old flat ones like your's
https://www.inaturalist.org/observations...
https://www.inaturalist.org/observations...

Would be an awesome addition to my project if you're interested in adding it https://www.inaturalist.org/projects/ter...

loarie, thanks for clarifying. I was going by the one in the link you gave me. The body seemed too slim and when I looked at more for that species on iNaturalist all the ones on top seemed to be drastically less broad. I found some more photos of Ligia pallasii that seem to match mine better online after your recent comment by searching further on the iNaturalist list and elsewhere on the web. Why the huge difference in width? Is it a male female thing or an age difference?

I'm 100% sure. I'm a scientist at the California Academy of Sciences and Oniscidea (terrestrial isopoda) is my specialty. Are you disputing that its an Oniscidean, in the genus Ligia, or L. pallasii specifically? Happy to explain more. And feel free to check out my Oniscidea citizen-science project https://www.inaturalist.org/projects/ter...

loarie, that is also an isopod, but they are definitely not the same species. Thanks for looking into it though

this is https://www.inaturalist.org/taxa/84264-L...