Kingdom Animalia Class Insecta Suborder Zygoptera Scientific name Enallagma annexum | Phylum Arthropoda Order Odonata Family Coenagrionidae Rank Species | |
 | ||
Similar Boreal bluet, Tule bluet, Marsh bluet, Coenagrion resolutum, Familiar bluet | ||
Enallagma annexum, the northern bluet, is a species of damselfly in the family Coenagrionidae. Enallagma annexum was formerly included with Enallagma cyathigerum.
Contents
Identification
The northern bluet is a small damselfly with a length of 1 to 1.6 inches (26 to 40 mm) long. The male is predominately blue on the sides of its thorax, and the upper side of its abdomen. Its lower abdominal appendages are longer than its upper appendages. The female's body is greenish-yellow to brown color. The upper side of its abdomen is mostly black.
Flight season
Northern bluets have a flight season of early May to July.
Similar species
Like many bluets in the genus Enallagma many species look similar to each other. The northern bluet looks has similar to many bluet species. They include the boreal bluet, familiar bluet, Hagen's bluet, marsh bluet, and vernal bluet. It can be distinguished from familiar bluet by the large postocular spots and the shorter cerci. The characteristics shared by northern and boreal bluets are their large eyespots, and a mushroom-shaped black spot on abdominal segment S2. Its best seen dorsally.
