huge swarm of crustaceans about 1 metre below the surface of Greenland Dock London SE16
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Thanks wezwez. It does look like Praunus flexuosus except that P. flexuosus has this "pronounced bend in the abdomen" that I don't see in my specimens. Perhaps it develops with age? Mine are only about 10mm in length. Perhaps they change as they mature? In any case, I guess I ought to get a better photo...
Lat/Lng: 51.4952, -0.0383
OS grid ref: TQ362791