Georissidae

One British species, Georissus crenulatus (Rossi), which is a local species found on, and usually caked in, the drying mud and silt of river banks and coasts.  Somewhat resembling a miniature bloody-nosed beetle (Timarcha tenebricosa (Fabricius)), G. crenulatus is 1-2.2mm long, all black, with clubbed antennae and striate elytra.  Elytra have punctuate stria, with raised or tuberculate intervals.