Mercuurwaterjuffer - Coenagrion mercuriale

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Mercuurwaterjuffer - Coenagrion mercuriale - HMNatuurfotografie

Net als de Gaffelwaterjuffer is ook de Mercuur een uit het zuiden oprukkende soort. Ze zijn te vinden bij zonnig gelegen stroompjes met een rijke vegetatie. De mannetjes zijn herkenbaar aan de tekening op segment S2 in de vorm van een mercuriushelm. Het vrouwtje heeft een donker achterlichaam en een klein lobje aan het halsschild.