Biology:Thecagaster bidentata

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Short description: Species of dragonfly

Thecagaster bidentata
Male, Romania
Scientific classification edit
Missing taxonomy template (fix): Thecagaster
Species:
Template:Taxonomy/ThecagasterT. bidentata
Binomial name
Template:Taxonomy/ThecagasterThecagaster bidentata
(Selys, 1843)
Synonyms
  • Cordulegaster bidentata Selys, 1843

Thecagaster bidentata, also known as sombre goldenring or two-toothed goldenring, is a species of dragonfly in the family Cordulegastridae.[2]

This species was formerly a member of the genus Cordulegaster, and is sometimes referred to as Cordulegaster bidentata.[3][4]

Description

This species is identifiable by its black body and yellow rings.[5] Adults are approximately 8 centimetres (3.1 in) in body length with a 10 centimetres (3.9 in) wingspan, and have a similar appearance to the related species Cordulegaster boltonii.[6]

Distribution and habitat

This species is primarily found in Central and Southern Europe,[7] spreading as far south as Sicily, where the subspecies Thecagaster bidentata sicilica is found.[2] It lives primarily around mountain springs.[8] This species is scattered throughout Central and Western Europe. The population rate is declining, the biggest threat to this species being droughts which are a result of global warming.[2]

Behaviour and development

Larva

Thecagaster bidentata breeds in mountain springs, and the larvae are benthic, living in the lowest reaches of the water.[9] As a result of this, larval sites are difficult to locate and study. Breeding takes place in May–June, with eggs being laid in the upper reaches of the streams. Larval development takes between three and five years, and can be slowed if cold weather causes the water to freeze.[6] The larvae may sometimes leave the water, hunting for small arthropods on the ground at night.[10]

References

  1. ↑ Paulson, D.R. (2020). "Cordulegaster bidentata". IUCN Red List of Threatened Species 2020. doi:10.2305/IUCN.UK.2020-3.RLTS.T165498A140229216.en. https://www.iucnredlist.org/species/165498/140229216. Retrieved 11 November 2021. 
  2. ↑ 2.0 2.1 2.2 "Cordulegaster bidentata". ICUN. http://www.iucnredlist.org/details/165498/0. 
  3. ↑ "Catalogue of Life, Thecagaster bidentata (Selys, 1843)". https://www.catalogueoflife.org/data/taxon/CL3HN. 
  4. ↑ Abbott, J. C. (2026). "OdonataCentral: An online resource for the distribution and identification of Odonata". https://www.odonatacentral.org/. 
  5. ↑ "Sombre goldenring (Cordulegaster bidentata)". http://www.arkive.org/sombre-goldenring/cordulegaster-bidentata/. 
  6. ↑ 6.0 6.1 "Cordulegaster bidentata". http://defworld.freeoda.com/Species%20Details/Cordulegaster%20bidentata.html. 
  7. ↑ "Sombre Goldenring (Cordulegaster bidentata)". http://www.dragonflypix.com/speciespages/cordulegaster_bidentata.html. 
  8. ↑ Brunke, Matthew (Dec 2003). "Patchiness of River: Groundwater Interactions within Two Floodplain Landscapes and Diversity of Aquatic Invertebrate Communities". Ecosystems 6 (8): 713. doi:10.1007/pl00021501. https://www.dora.lib4ri.ch/eawag/islandora/object/eawag%3A4883. 
  9. ↑ Victor Fet; Alexi Popov (21 June 2007). Biogeography and Ecology of Bulgaria. Springer Science & Business Media. p. 224. ISBN 978-1-4020-4417-5. https://books.google.com/books?id=I3TaFGsQHKMC&pg=PA224. 
  10. ↑ Suhling, F.; Sahlén, G.; Gorb, S.; Kalkman, V.J.; Dijkstra, K.-D.B.; van Tol, J. (2015). "Order Odonata". in Thorp, James; Rogers, D. Christopher. Ecology and general biology. Thorp and Covich's Freshwater Invertebrates (4 ed.). Academic Press. pp. 893–932. ISBN 978-0-12-385026-3. 

Wikidata ☰ Q1519595 entry



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