Archaeosynthemis orientalis

Archaeosynthemis orientalis is a species of dragonfly of the family Synthemistidae,[3] commonly known as the eastern brown tigertail.[4] It is a medium-sized dragonfly with reddish-brown and yellow markings.[4] It inhabits boggy creeks and swamps in eastern Australia[5][6]

Eastern brown tigertail

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Odonata
Infraorder: Anisoptera
Family: Synthemistidae
Genus: Archaeosynthemis
Species:
A. orientalis
Binomial name
Archaeosynthemis orientalis
Synonyms[3]
  • Synthemis macrostigma orientalis Tillyard, 1910

Archaeosynthemis orientalis appears similar to Archaeosynthemis occidentalis found in Western Australia.[4]

  • Female wings
  • Male wings
gollark: Wikipedia says that spider silk has a diameter of "2.5–4 μm", which I approximated to 3μm for convenience, so a strand has a 1.5μm radius. That means that its cross-sectional area (if we assume this long thing of spider silk is a cylinder) is (1.5e-6)², or ~7e-12. Wikipedia also says its density is about 1.3g/cm³, which is 1300kg/m³, and that the observable universe has a diameter of 93 billion light-years (8.8e26 meters). So multiply the length of the strand (the observable universe's diameter) by the density of spider silk by the cross-sectional area of the strand and you get 8e18 kg, while the atmosphere's mass is about 5e18 kg, so close enough really.
gollark: Okay, so by mass it actually seems roughly correct.
gollark: So, spider silk comes in *very* thin strands and is somewhat denser than water, interesting.
gollark: You do that, I'll try and find data on spider silk density.
gollark: Actually, this factoid does seem kind of dubious even if it's meant to say "mass"... hmm.

See also

References
  1. Dow, R.A. (2017). "Archaeosynthemis orientalis". IUCN Red List of Threatened Species. 2017: e.T89904293A89904304. doi:10.2305/IUCN.UK.2017-1.RLTS.T89904293A89904304.en.
  2. Tillyard, R.J. (1910). "Monograph of the genus Synthemis. (Neuroptera: Odonata)". Proceedings of the Linnean Society of New South Wales. 35: 312–377 [355] – via Biodiversity Heritage Library.
  3. "Species Archaeosynthemis orientalis (Tillyard, 1913)". Australian Faunal Directory. Australian Biological Resources Study. 2012. Retrieved 4 March 2017.
  4. Theischinger, Günther; Hawking, John (2006). The Complete Field Guide to Dragonflies of Australia. Collingwood, Victoria, Australia: CSIRO Publishing. p. 198. ISBN 978 0 64309 073 6.
  5. Theischinger, Gunther; Endersby, Ian (2009). Identification Guide to the Australian Odonata (PDF). Department of Environment, Climate Change and Water NSW. p. 193. ISBN 978 1 74232 475 3.
  6. Watson, J.A.L.; Theischinger, G.; Abbey, H.M. (1991). The Australian Dragonflies: A Guide to the Identification, Distributions and Habitats of Australian Odonata. Melbourne: CSIRO. p. 278. ISBN 0643051368.
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