Atrax is a genus of venomous spiders found in Australia. It is a member of the family Atracidae, the Australian funnel-web spiders. The genus was erected by Octavius Pickard-Cambridge in 1877 for the species Atrax robustus.
- Atrax robustus O.P.-Cambridge, 1877 — Sydney Basin, New South Wales
- Atrax yorkmainorum Gray, 2010 — Canberra region, Southern New South Wales
- Atrax sutherlandi Gray, 2010 — New South Wales far south coast, East Gippsland Victoria
Phylogeography can be understood as the historical changes or occurrences that bring about a change to a specific species or organism. After extensive studies, researches have found that there are many geographical and genetic differences that have occurred due to micro habitat distributions. The assumption has been made that species of Atrax have experienced a shift in genetic structure due to the niches they inhabit. Habitats are not the only factor to this divergence, researchers also noted the climatic events, prey availability, and natural occurrence of biodiversity 
- "Gen. Atrax O. Pickard-Cambridge, 1877". World Spider Catalog. Natural History Museum Bern. Retrieved 2016-01-27.
- Gray, Michael R. (24 November 2010). "A revision of the Australian funnel-web spiders (Hexathelidae: Atracinae)" (PDF). Records of the Australian Museum. 62 (3): 285–392. doi:10.3853/j.0067-1975.62.2010.1556.
- Beavis, Amber S., et al. "Microhabitat Preferences Drive Phylogeographic Disparities in Two Australian Funnel Web Spiders." Biological Journal of the Linnean Society, vol. 104, no. 4, Dec. 2011, pp. 805–819