Mecysmaucheniidae is a family of araneomorph spiders first described by Eugène Simon in 1895. Most genera occur in South America (Chile and Argentina), with two genera endemic to New Zealand.

Genera , this family includes seven genera and 25 species:

Aotearoa Forster & Platnick, 1984 – New Zealand Chilarchaea Forster & Platnick, 1984 – Argentina, Chile Mecysmauchenioides Forster & Platnick, 1984 – Argentina, Chile Mecysmauchenius Simon, 1884 – Argentina, Chile, Falkland Islands Mesarchaea Forster & Platnick, 1984 – Chile Semysmauchenius Forster & Platnick, 1984 – Chile Zearchaea Wilton, 1946 – New Zealand

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