Petrichus is a genus of South American running crab spiders that was first described by Eugène Louis Simon in 1886.

Species: it contains fourteen species, found in Brazil, Argentina, Ecuador, Chile, Peru, Colombia and on the Falkland Islands:

• Petrichus anomalus (Mello-Leitão, 1938) – Argentina
• Petrichus eremicus Griotti & Grismado, 2022 – Chile
• Petrichus funebris (Nicolet, 1849) – Chile, Argentina
• Petrichus griseus Berland, 1913 – Colombia, Ecuador, Peru
• Petrichus junior (Nicolet, 1849) – Chile, Argentina
• Petrichus marmoratus Simon, 1886 (type) – Argentina
• Petrichus meridionalis (Keyserling, 1891) – Brazil
• Petrichus niveus (Simon, 1895) – Chile, Argentina, Falkland Is.
• Petrichus patagoniensis Griotti & Grismado, 2022 – Argentina
• Petrichus roijunenti Griotti & Grismado, 2022 – Chile, Argentina
• Petrichus sordidus Tullgren, 1901 – Argentina
• Petrichus spira Griotti & Grismado, 2022 – Argentina
• Petrichus tobioides Mello-Leitão, 1941 – Argentina
• Petrichus tullgreni Simon, 1902 – Chile, Argentina, Falkland Is.