Atrax montanus

{{Use dmy dates|date=January 2024}}

{{Use Australian English|date=January 2024}}

{{Short description|Large Australian venomous spider}}

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|taxon = Atrax montanus

|authority = (Rainbow, 1914)

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Atrax montanus, the Southern Sydney funnel-web spider, is a species of venomous mygalomorph spider native to eastern Australia, usually found near the Blue Mountains from the Central Coast south to the Georges River, extending as far west as Baulkham Hills near the southern end of its distribution.{{Cite web |last=Vince |first=Claire |title=Scientists resolve "identity crisis" for Australia's deadliest spider |url=https://australian.museum/about/organisation/media-centre/sydney-funnel-web-spider-reclassified/ |access-date=2025-01-15 |website=The Australian Museum |language=en}} It is a member of a group of spiders known as Australian funnel-web spiders. The species was described in 1914 but was later considered to be the same species as Atrax robustus until 2025.{{Cite journal |last=Gray |first=Michael R. |date=2010-11-24 |title=A revision of the Australian funnel-web spiders (Hexathelidae: Atracinae) |url=https://doi.org/10.3853/j.0067-1975.62.2010.1556 |journal=Records of the Australian Museum |volume=62 |issue=3 |pages=285–392 |doi=10.3853/j.0067-1975.62.2010.1556 |issn=0067-1975}}{{Cite journal |last1=Loria |first1=Stephanie F. |last2=Frank |first2=Svea-Celina |last3=Dupérré |first3=Nadine |last4=Smith |first4=Helen M. |last5=Jones |first5=Braxton |last6=Buzatto |first6=Bruno A. |last7=Harms |first7=Danilo |date=2025-01-13 |title=The world's most venomous spider is a species complex: systematics of the Sydney funnel-web spider (Atracidae: Atrax robustus) |journal=BMC Ecology and Evolution |volume=25 |issue=1 |pages=7 |doi=10.1186/s12862-024-02332-0 |doi-access=free |issn=2730-7182 |pmc=11727706 |pmid=39800689}} They have similar distributions and look extremely similar.{{Cite web |last=Smith|first=Helen |title=Sydney's famous funnel-web spider splits into three! |url=https://australian.museum/blog/amri-news/sydneys-famous-funnel-web-spider-splits-into-three/ |access-date=2025-01-15 |website=The Australian Museum |language=en |archive-date=14 January 2025 |archive-url=https://web.archive.org/web/20250114094730/https://australian.museum/blog/amri-news/sydneys-famous-funnel-web-spider-splits-into-three/ |url-status=live}}