The Mecysmaucheniidae are family of araneomorph spiders with 25 described species in seven genera.
Most genera only occur in South America (Chile and Argentina), with two genera endemic to New Zealand.
The categorization into subfamilies follows Joel Hallan's Biology Catalog.
Mecysmaucheniinae Simon, 1895
Aotearoa Forster & Platnick, 1984
Aotearoa magna (Forster, 1949) (New Zealand)
Mecysmauchenioides Forster & Platnick, 1984
Mecysmauchenioides nordenskjoldi (Tullgren, 1901) (Chile, Argentina)
Mecysmauchenioides quetrihue Grismado & Ramírez, 2005 (Argentina)
Mecysmauchenius Simon, 1884
Mecysmauchenius canan Forster & Platnick, 1984 (Chile)
Mecysmauchenius chacamo Forster & Platnick, 1984 (Chile)
Mecysmauchenius chapo Forster & Platnick, 1984 (Chile)
Mecysmauchenius chepu Forster & Platnick, 1984 (Chile)
Mecysmauchenius chincay Forster & Platnick, 1984 (Chile)
Mecysmauchenius eden Forster & Platnick, 1984 (Chile)
Mecysmauchenius fernandez Forster & Platnick, 1984 (Juan Fernandez Is.)
Mecysmauchenius gertschi Zapfe, 1960 (Chile, Argentina)
Mecysmauchenius newtoni Forster & Platnick, 1984 (Chile)
Mecysmauchenius osorno Forster & Platnick, 1984 (Chile, Argentina)
Mecysmauchenius platnicki Grismado & Ramírez, 2005 (Chile)
Mecysmauchenius puyehue Forster & Platnick, 1984 (Chile)
Mecysmauchenius segmentatus Simon, 1884 (Chile, Argentina, Falkland Is.)
Mecysmauchenius termas Forster & Platnick, 1984 (Chile)
Mecysmauchenius thayerae Forster & Platnick, 1984 (Chile, Argentina)
Mecysmauchenius victoria Forster & Platnick, 1984 (Chile)
Mecysmauchenius villarrica Forster & Platnick, 1984 (Chile)
Mesarchaea Forster & Platnick, 1984
Mesarchaea bellavista Forster & Platnick, 1984 (Chile)
Semysmauchenius Forster & Platnick, 1984
Semysmauchenius antillanca Forster & Platnick, 1984 (Chile)
Zearchaeinae Forster & Platnick, 1984
Chilarchaea Forster & Platnick, 1984
Chilarchaea quellon Forster & Platnick, 1984 (Chile, Argentina)
Zearchaea Wilton, 1946
Zearchaea clypeata Wilton, 1946 (New Zealand)
Zearchaea fiordensis Forster, 1955 (New Zealand)