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Cordulegaster bidentata

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description Cordulegaster bidentata Overview

Cordulegaster bidentata, commonly called the sombre goldenring, is a dragonfly in the family Cordulegastridae. The species was described by Edmond de Selys Longchamps in 1843 and occurs in parts of central and southern Europe. It is closely associated with shaded, calcareous springs, seepages, and very small streams, where its aquatic larvae develop in soft sediment; adults are identified by a dark body patterned with relatively restrained yellow markings.

help Cordulegaster bidentata FAQ

What is the natural habitat of the Cordulegaster bidentata?

The Sombre Goldenring, or Cordulegaster bidentata, primarily breeds in small, shaded, calcareous springs and tiny trickling streams. This highly specific habitat requirement makes them an indicator species for clean, unpolluted water sources across central and southern Europe.

How is the Cordulegaster bidentata different from other goldenring dragonflies?

Unlike the more common Golden-ringed Dragonfly, Cordulegaster bidentata is smaller and exclusively prefers trickling spring seepages rather than larger, faster-flowing streams. Entomologist Edmond de Selys-Longchamps described it in 1843, noting its unique ecological preferences compared to its relatives.

What time of year does the Sombre Goldenring fly?

The Sombre Goldenring is typically active during the mid-summer months, usually flying from June through to September. Because of its reliance on tiny spring habitats, males can often be seen flying low over the ground or resting on vegetation near the water's edge.

Is the Cordulegaster bidentata an endangered species?

While globally listed as least concern, Cordulegaster bidentata faces localized threats due to the drying up of small springs and agricultural water pollution. Its dependence on highly specialized calcareous spring habitats makes populations vulnerable to climate change and groundwater extraction.

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