Help with I.D. can't find anything on this at all.
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To see the iridescent spots you need to use the detailed zoom view of the photo.
Just found out that some earthworms lubricate themselves with iridescent slime. The one that I found was crawling along a stone path on a summers day. That explains that then.
I can stop trawling Google now.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
It is very difficult to tell the species of immature earthworms (which don't have a saddle or reproductive parts). But see our guide here http://www.opalexplorenature.org/Earthwormguide for adult worms.
OPAL Community Scientist
Yorkshire and Humber
Lat/Lng: 51.5, -3.0
OS grid ref: ST3288