U zoniranju, holarktik (arktogea)[3] je podjeljen na dva područja:neoarktičko ipalearctičko. Na jugu nema jasne granice, ali postoji prelazna zona u druge biogeografske regije. Na kontinentuAmerika to jeSrednja Amerika, uAfriciSahara. U zapadnoj Aziji tranzicijska zona jeArabijsko poluostrvo, ne računajući njegov južni dio.
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