Our largest Scolopendromorph centipede (52 mm)found under a paving slab.
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Andy, thanks for the clear set of pictures and description. I have tagged this observation 'IDTip' so that others can retrieve this in the future. This is a little experiment we are trying to see if we can make informative observations such as yours easier to find again. If you make any more observations of this quality, you can tag them yourself just by adding the tag IDTip when you upload the observation. (and you can do the same by editing any existing ones too).
University of Edinburgh and Biodiversity Observatory (OU)
I remember being bitten by a large specimen of this in Torquay. Painful at the time but not lasting very long.
Lat/Lng: 51.3271, -0.1692
OS grid ref: TQ276602