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Ospreys are an indicator species. The health of their population has implications for the health our coastal ecosystems.

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New Jersey Endangered and Threatened Species Field Guide

Image of An adult female ski-tailed emerald.Zoom+ An adult female ski-tailed emerald. © Glenn Corbiere

Ski-tailed emerald

Somatochlora elongata

Species Group: Invertebrate

Conservation Status

State: Special Concern



The ski-tailed emerald ranges between 2.2”-2.4”. The brown thorax has lateral yellow markings, an anterior stripe and posterior spot. The abdomen is narrow and mostly black. The female is similar to the male in appearance but has a wide triangular ovipositor.

Image of Range of the ski-tailed emerald in New Jersey.Zoom+ Range of the ski-tailed emerald in New Jersey.


The ski-tailed emerald is rare in New Jersey and is found in only two known locations in Morris and Sussex counties. It prefers the habitat found along vegetated lake and pond outlet streams and breeds in slow-moving streams found in bogs and swamps.


Larvae are predatory and adults feed on other invertebrates.


It is believed that the ski-tailed emerald is active from mid-June to mid-July in New Jersey. More information is needed on this species in New Jersey.


The ski-tailed emerald is considered a species of Special Concern in New Jersey due to its rarity.

Text derived from the book, Field Guide to Dragonflies and Damselflies of New Jersey. 2009. By Allen E. Barlow, David M. Golden and Jim Bangma. Edited and updated by Larissa Smith in 2011.

Scientific Classification

Kingdom: Animalia
    Phylum: Arthropoda
       Class: Insecta
          Order: Odonata
             Family: Corduliidae
                Genus: Somatochlora
                   Species: S. elongata

Find Related Info: Invertebrates, Special concern

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