Following European countries with records of C. mortuorum are listed by Fauna Europea (excluding countries on this map): Austria, Belarus, Belgium, Czech Republic, Danish mainland, Faroe Is., French mainland, Hungary, Iceland, Italian mainland, Lithuania, North European Russia, Poland, Romania, Slovakia, Sweden, Switzerland... In Poland it is very common species with dozens of published records in local faunistic papers.

Thanks to K. SZPILA for this comment