Coenagrion is a genus of damselflies in the family Coenagrionidae, commonly called the Eurasian Bluets (although three species are found in North America: Coenagrion angulatum, Coenagrion interrogatum, and Coenagrion resolutum ). Species of Coenagrion are generally medium-sized, brightly coloured damselflies.

Species

The genus Coenagrion includes the following species: • Coenagrion aculeatum Yu & Bu, 2007 • Coenagrion armatum (Charpentier, 1840) – Norfolk Damselfly or Dark Bluet • Coenagrion angulatum Walker, 1912 – Prairie Bluet • Coenagrion australocaspicum Dumont & Heidari, 1996 • Coenagrion caerulescens (Fonscolombe, 1838) – Mediterranean Bluet • Coenagrion chusanicum Navás, 1933 • Coenagrion dorothaea Fourcroy, 1785 • Coenagrion ecornutum (Selys, 1872) • Coenagrion exclamationis (Fraser, 1919) • Coenagrion glaciale (Selys, 1872) • Coenagrion hastulatum Charpentier, 1825 – Northern Damselfly, Spearhead Bluet • Coenagrion holdereri (Förster, 1900) • Coenagrion hylas (Trybom, 1889) – Siberian Bluet • Coenagrion intermedium Lohmann, 1990 – Cretan Bluet • Coenagrion interrogatum (Hagen in Selys, 1876) – Subarctic Bluet • Coenagrion johanssoni (Wallengren, 1894) – Arctic Bluet • Coenagrion lanceolatum (Selys, 1872) • Coenagrion lunulatum (Charpentier, 1840) – Irish Damselfly, Crescent Bluet • Coenagrion lyelli (Tillyard, 1913) – Swamp Bluet • Coenagrion melanoproctum (Selys, 1876) • Coenagrion mercuriale (Charpentier, 1840) – Southern Damselfly, Mercury Bluet • Coenagrion ornatum (Selys, 1850) – Ornate Bluet • Coenagrion persicum Lohmann, 1993 • Coenagrion ponticum (Bartenef, 1929) • Coenagrion puella (Linnaeus, 1758) – Azure Damselfly • Coenagrion pulchellum (Van der Linden, 1823) – Variable Damselfly • Coenagrion resolutum (Hagen in Selys, 1876) – Taiga Bluet • Coenagrion scitulum (Rambur, 1842) – Dainty Damselfly, Dainty Bluet • Coenagrion syriacum (Morton, 1924) – Syrian Bluet • Coenagrion terue (Asahina, 1949)

Biology

Thermal adaptation

This genus's capacity for phenotypically plastic responses to the surface air temperature is important to species' ranges. These thermal responses will also decide a great deal of these species' responses to climate change. Nilsson-Örtman et al., 2012 find a high degree of thermal adaptation in high latitude populations of Coenagrion. They found similar plasticity even for various sympatric species at the same locations, and despite the highly variable weather at such latitudes.