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That caught me totally unprevented! I never could have imagined they're other than Lispe, and they're even not muscomorphs!!! Big thanks to all you for unblind me.

Looks like there are only three species in Spain, praecox, oceanus and balticus. Are all they like this one? Can be found all three in a salty marsh near coast in Almeria province in end of July? I tought Hydrophorus were smaller and darker...