Enallagma cyathigerum

Common blue damselfly
	Young adult male
	Young adult female
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Odonata
Suborder:	Zygoptera
Family:	Coenagrionidae
Genus:	Enallagma
Species:	E. cyathigerum
Binomial name
	Enallagma cyathigerum; (Charpentier, 1840)
Synonyms
	Agrion annexum Stephens, 1835 (nec Charpentier, 1825); Agrion pulchrum Hagen, 1840; Agrion charpentieri Selys, 1840; Agrion annexum Hagen, 1861; Enallagma robustum Selys, 1875; Enallagma continentale Belyshev, 1956;

Enallagma cyathigerum (common blue damselfly, common bluet, or northern bluet) is a species found mainly between latitudes 40°N and 72°N;^[2] It is widely distributed in the Palearctic, and the Nearctic species Enallagma annexum was at one time considered to be synonymous with it. The species can reach a length of 32 to 35 mm (1.3 to 1.4 in). It is common in many different countries including Russia, Sweden, Norway, Finland, the United States of America, and South Korea.^[3]^[4] Damselflies are an important link between the health of the aquatic ecosystem and its response to climate change.^[5]

^ Clausnitzer, V. (2020). "Enallagma cyathigerum". IUCN Red List of Threatened Species. 2020: e.T173805983A785848. doi:10.2305/IUCN.UK.2020-3.RLTS.T173805983A785848.en. Retrieved 23 January 2024.
^ Johansson, Frank (2003). "Latitudinal shifts in body size of Enallagma cyathigerum (Odonata)". Journal of Biogeography. 30 (1): 29–34. Bibcode:2003JBiog..30...29J. doi:10.1046/j.1365-2699.2003.00796.x. ISSN 1365-2699.
^ Bots, Jessica; De Bruyn, Luc; Snijkers, Tom; Van Den Branden, Bert; Van Gossum, Hans (2010). "Exposure to perfluorooctane sulfonic acid (PFOS) adversely affects the life-cycle of the damselfly Enallagma cyathigerum". Environmental Pollution. 158 (3): 901–905. Bibcode:2010EPoll.158..901B. doi:10.1016/j.envpol.2009.09.016. ISSN 0269-7491. PMID 19811863.
^ Parr, M. J. (1976). "Some aspects of the population ecology of the damselfly Enallagma cyathigerum (Charpentier) (Zygoptera: Coenagrionidae)". Odonatologica. 5: 45–57.
^ Callahan, Melissa S.; McPeek, Mark A. (2016). "Multi-locus phylogeny and divergence time estimates of Enallagma damselflies (Odonata: Coenagrionidae)". Molecular Phylogenetics and Evolution. 94 (Pt A): 182–195. Bibcode:2016MolPE..94..182C. doi:10.1016/j.ympev.2015.08.013. ISSN 1055-7903. PMID 26318206.