Euathlus is a genus of South American tarantulas that was first described by Anton Ausserer in 1875. These spiders are medium sized and are usually found in high elevations in the Andes. It is a senior synonym of Paraphysa, and was formerly considered a senior synonym of Brachypelma, but this was later rejected.

Diagnosis: Males own a palpal bulb with two prolateral keels, with the tip curved retrolaterally. The tibial apophyses has retrolateral spines and a spine on the retrolateral branch which almost reached the apex. And a urticating patch in the center of the opisthosoma, which own mainly type 3 and 4 urticating hairs. Females also can be distinguished by two 4 sided spermathecal receptacles, with sphere like chambers.

Species: it contains fourteen species, found in Argentina, Chile and Peru:

• Euathlus affinis (Nicolet, 1849) – Chile
• Euathlus antai Perafán & Pérez-Miles, 2014 – Chile
• Euathlus atacama Perafán & Pérez-Miles, 2014 – Chile
• Euathlus condorito Perafán & Pérez-Miles, 2014 – Chile
• Euathlus diamante Ferretti, 2015 – Argentina
• Euathlus grismadoi Ríos-Tamayo, 2020 – Argentina
• Euathlus manicata (Simon, 1892) – Chile
• Euathlus mauryi Ríos-Tamayo, 2020 – Argentina
• Euathlus pampa Ríos-Tamayo, 2020 – Argentina
• Euathlus parvulus (Pocock, 1903) – Chile
• Euathlus sagei Ferretti, 2015 – Argentina
• Euathlus tenebrarum Ferretti, 2015 – Argentina
• Euathlus truculentus L. Koch, 1875 (type) – Chile, Argentina
• Euathlus vanessae Quispe-Colca & Ferretti, 2021 – Peru

In synonymy: 

• E. phryxotrichoides (Strand, 1907) = Euathlus truculentus

Nomen dubium: 

• Euathlus roseus (Guérin, 1838) - Chile

Transferred to other genera: