Identification key to male emerald dragonflies

Somatochlora arctica Cordulia aenea
Northern Emerald
Calliper-shaped anal appendages, frons with lateral yellow spots		 Downy Emerald
Short, curved anal appendages, no yellow on frons

Nelson, B., Thompson, R. & Morrow, C., 2000 (June 29). [In] DragonflyIreland http://www.ulstermuseum.org.uk/dragonflyireland/

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