Gomphus spicatus Hagen (Odonata: Gomphidae), commonly called dusky clubtail, is a common and widely distributed dragonfly in a variety of ponds, lakes, and slow streams throughout its range in the north-eastern and northcentral United States and adjacent areas of southern Canada (Donnelly 2004).
DuBois, Robert B. and Stettner, Craig R.
"Gomphus Spicatus (Odonata: Gomphidae) Rediscovered in Illinois and Libellula Semifasciata (Odonata: Libellulidae) Recorded Near Wisconsin,"
The Great Lakes Entomologist: Vol. 40
, Article 13.
Available at: https://scholar.valpo.edu/tgle/vol40/iss1/13