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Hi Steve, I'm only testing the water so to speak with my limited but slowly increasing knowledge of woodlice etc. I will defer to your expert knowledge on this one but have noted the differences between the 2 species for the future. I have agreed with your ID to set the record straight. Regards Chris
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I'm probably repeating what you have just noted! Anyway, in A. vulgare the scutellum is more or less level with the top of the head (not at all obvious). At the opposite extreme, in A.nasatum, the scutellum is narrow and markedly raised. In A.depressum it is somewhat intermediate, with the scutellum broad and but still distinctly rising between the antennae. This is quite clear in this image. In most Armadillidium species the sides of the body at the rear end (i.e. the epimera of the pleon) are 'steep', looking more vertical than horizontal (such as seen in the 'flattend' Oniscus). However, in A.depressum the epimera of the pleon are noticeably 'splayed' out (not 'slayed' as stated above!) as if the back end had by slightly squashed flat. This is also clear in the image. The clear yellow flecks on dark grey body are also quite typical of many A.depressum (but similar flecks are often seen in A.vulgare).
Please compare images at http://www.bmig.org.uk/gallery/86/113
Most British woodlice can be identified (at least to species agg.) with a good photo, provided the relevant parts are in focus (usually head/antennae and uropds/telson at rear). I look forward to some challenging images from you on iSpot.
BMIG website: www.bmig.org.uk (centipedes, millipedes & woodlice)
BMIG Newsletters ~ www.bmig.org.uk/view/resource/bmig-newsletter
BMIG Bulletins ~ www.bmig.org.uk/view/resource/bmig-bulletin
Thanks Steve, slightly more complicated than I thought, I have saved the link for future use, regards Chris.
Southern Pill Woodlouse very common around Bristol.
Lat/Lng: 51.5808, -2.8107
OS grid ref: ST439871