- family: Archaeidae
- family: Holarchaeidae
- family: Huttoniidae
- family: Mecysmaucheniidae
- genus: Aotearoa Forster & Platnick, 1984
- genus: Chilarchaea Forster & Platnick, 1984
- genus: Mecysmauchenioides Forster & Platnick, 1984
- genus: Mecysmauchenius
- species: Mecysmauchenius canan Forster & Platnick, 1984
- species: Mecysmauchenius chacamo Forster & Platnick, 1984
- species: Mecysmauchenius chapo Forster & Platnick, 1984
- species: Mecysmauchenius chepu Forster & Platnick, 1984
- species: Mecysmauchenius chincay Forster & Platnick, 1984
- species: Mecysmauchenius eden Forster & Platnick, 1984
- species: Mecysmauchenius fernandez Forster & Platnick, 1984
- species: Mecysmauchenius gertschi Zapfe, 1960
- species: Mecysmauchenius newtoni Forster & Platnick, 1984
- species: Mecysmauchenius osorno Forster & Platnick, 1984
- species: Mecysmauchenius puyehue Forster & Platnick, 1984
- species: Mecysmauchenius segmentatus Simon, 1884
- species: Mecysmauchenius termas Forster & Platnick, 1984
- species: Mecysmauchenius thayerae Forster & Platnick, 1984
- species: Mecysmauchenius victoria Forster & Platnick, 1984
- species: Mecysmauchenius villarrica Forster & Platnick, 1984
- genus: Mesarchaea Forster & Platnick, 1984
- genus: Semysmauchenius Forster & Platnick, 1984
- genus: Zearchaea
- family: Micropholcommatidae
- family: Mimetidae
- family: Palpimanidae
- family: Pararchaeidae
- family: Stenochilidae