Aciagrion fragile

{{Speciesbox

| name = Blue slim

| image = Aciagrion fragilis 0491.jpg

| image_caption = Male, north Queensland

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn | author = Kalkman, V. |title = Aciagrion fragile | volume= 2009 | page = e.T163931A5669237 | date = 2009 | doi = 10.2305/IUCN.UK.2009-2.RLTS.T163931A5669237.en }}

| taxon = Aciagrion fragile

| authority = (Tillyard, 1906){{Cite journal|last=Tillyard|first=R.J.|year=1906|title=New Australian species of the family Agrionidae (Neuroptera: Odonata)|url=https://www.biodiversitylibrary.org/page/39342431|journal=Proceedings of the Linnean Society of New South Wales|volume=31|pages=177–194 [186]|via=Biodiversity Heritage Library}}

| range_map = Aciagrion fragilis distribution map AU+PNG.svg

}}

Aciagrion fragile is a species of damselfly in the family Coenagrionidae,{{Cite web|url=https://biodiversity.org.au/afd/taxa/Aciagrion_fragile |title=Species Aciagrion fragile (Tillyard, 1906)|date=2023|website=Australian Faunal Directory|publisher=Australian Biological Resources Study|access-date=19 December 2023}}

commonly known as a blue slim.{{Cite book|title=The Complete Field Guide to Dragonflies of Australia|last1=Theischinger|first1=Günther|last2=Hawking|first2=John|publisher=CSIRO Publishing|year=2006|isbn=978-0-64309-073-6|location=Collingwood, Victoria, Australia|pages=98}}

It is a small, slender damselfly, the male is blue and black.

It has been recorded from northern Australia, New Guinea and the Lesser Sunda Islands in Indonesia,{{Cite book|title=The Australian Dragonflies: A Guide to the Identification, Distributions and Habitats of Australian Odonata|last1=Watson|first1=J.A.L.|last2=Theischinger|first2=G.|last3=Abbey|first3=H.M.|publisher=CSIRO|year=1991|isbn=0643051368|location=Melbourne}}

where it inhabits still waters and swamps.{{cite book|title=Identification Guide to the Australian Odonata|last2=Endersby|first2=Ian|date=2009|publisher=Department of Environment, Climate Change and Water NSW|isbn=978-1-74232-475-3|pages=188|last1=Theischinger|first1=Gunther|url=http://www.environment.nsw.gov.au/resources/publications/09730AustOdonata.pdf}}

Etymology

The species name fragile is a Latin word meaning fragile, or easily broken. In 1906, Robin Tillyard named this species probably in contrast to other members of the genus Ischnura, where it had been provisionally placed.{{cite book |last1=Endersby |first1=Ian |last2=Fliedner |first2=Heinrich |title=The Naming of Australia's Dragonflies |date=2015 |publisher=Busybird Publishing |location=Eltham, Victoria, Australia |isbn=9781925260625 |url=https://www.researchgate.net/publication/283318421}}{{cite journal |last1=Endersby |first1=Ian |title=Etymology of the Dragonflies (Insecta: Odonata) named by R.J. Tillyard, F.R.S. |journal=Proceedings of the Linnean Society of New South Wales |date=2012 |volume=134 |pages=1–16 |url=https://www.researchgate.net/publication/277204891}} While the name was originally spelled "fragilis", the ICZN mandates that species names that are adjectival must agree in gender with the genus name, so when this species was moved to the genus Aciagrion, which is neuter in grammatical gender, the spelling of the species name changed to fragile.