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New Jersey Endangered and Threatened Species Field Guide

Image of An adult Septima's clubtail.Zoom+ An adult Septima's clubtail. © Allen Barlow

Septima's clubtail

Gomphus septima

Species Group: Invertebrate

Conservation Status

State: Special Concern



This large species reaches 2.2” and has a dark brown and pale green coloring. The eyes are grayish green and the abdomen is dark brown with yellow spots. The female has wider dorsal markings and paler legs.

Image of Range of the Septima's clubtail in New Jersey.Zoom+ Range of the Septima's clubtail in New Jersey.


The Septima’s clubtail found in New Jersey is a disjunct regional subspecies, found along the Delaware River in New Jersey, Pennsylvania and New York. It is found only in few segments of the Delaware River where major tributaries join the river.


Larvae are predatory and adults feed on other invertebrates


In late May emergence takes place and the adults are active throughout June.


The Septima’s clubtail is considered a species of Special Concern in New Jersey. It is one of the rarest clubtails In North America.

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: Gomphidae
                Genus: Gomphus
                   Species: G. septima

Find Related Info: Invertebrates, Special concern

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