TheStygnopsidae are a small family ofharvestmen, with almost all species found inMexico.

The name of the type genusStygnopsis is combined from the genusStygnus (Stygnidae) andAncient Greekopsis, "looks like".^[1]

The body length of these harvestmen ranges from 2.5 (Karos) to 7 mm (Hoplobunus). Their color ranges from dark brown to black, with much lighter appendages. Cave-dwelling species are pale light brown.^[1]

As in other Laniatores, most species have narrow distributions. Almost all species occur in Mexico, with some found in the southern USA (Hoplobunus), and Guatemala, El Salvador and Belize (Paramitraceras).

Epedanidae could be the sister group toGonyleptoideasensu lato (including theAssamiidae), with the Stygnopsidae the sister group to the rest of Gonyleptoidea. Although they reach into theNearctic, they are more closely related toneotropical harvestmen.^[1]

• HoplobunusBanks, 1900

• Hoplobunus apoalensisGoodnight & Goodnight, 1973 —Mexico
• Hoplobunus barrettiBanks, 1900 — Mexico
• Hoplobunus boneti(Goodnight & Goodnight, 1942) — cave, Mexico
• Hoplobunus madlaeGoodnight & Goodnight, 1967 — Texas
• Hoplobunus mexicanus(Roewer, 1915) — Mexico
• Hoplobunus mexicanus(Sørensen, 1932) — praeoccuppied; Mexico
• Hoplobunus oaxacensisGoodnight & Goodnight, 1973 — Mexico
• Hoplobunus osorioi(Goodnight & Goodnight, 1944) — Mexico
• Hoplobunus planusGoodnight & Goodnight, 1973 — Mexico
• Hoplobunus queretariusSilhavy 1974 — Mexico
• Hoplobunus russelliGoodnight & Goodnight, 1967 —Texas
• Hoplobunus spinooculorumGoodnight & Goodnight, 1973 — Mexico
• Hoplobunus zulliniiSilhavy 1977 — Mexico

• KarosGoodnight & Goodnight, 1944 — Mexico

• Karos barbarikosGoodnight & Goodnight, 1944
• Karos brignoliiSilhavy 1974
• Karos depressusGoodnight & Goodnight, 1971
• Karos dybasi(Goodnight & Goodnight, 1947)
• Karos foliorum(Goodnight & Goodnight, 1945)
• Karos gratiosusGoodnight & Goodnight, 1971
• Karos parvusGoodnight & Goodnight, 1971
• Karos projectusGoodnight & Goodnight, 1971
• Karos rugosusGoodnight & Goodnight, 1971
• Karos tuberculatus(Goodnight & Goodnight, 1944)
• Karos unispinosus(Goodnight & Goodnight, 1946)

• MexotroglinusSilhavy, 1977

• Mexotroglinus sbordoniiSilhavy, 1977 — Mexico

• ParamitracerasF. O. P-Cambridge, 1905

• Paramitraceras femoralisGoodnight & Goodnight, 1953 — Mexico
• Paramitraceras granulatusF. O. Pickard-Cambridge, 1905 —Guatemala,El Salvador, Mexico
• Paramitraceras hispidulusF. O. Pickard-Cambridge, 1905 — Guatemala,Belize, Mexico

• SbordoniaSilhavy 1977 — Mexico

• Sbordonia armigeraSilhavy 1977
• Sbordonia parvula(Goodnight & Goodnight, 1953)

• StygnopsisSørensen, 1902 — Mexico

• Stygnopsis robusta(Goodnight & Goodnight, 1971)
• Stygnopsis valida(Sørensen, 1884)

• TampiconusRoewer, 1949

• Tampiconus philippiiRoewer, 1949 — Mexico

• TroglostygnopsisSilhavy, 1974 — Mexico

• Troglostygnopsis anophthalmaSilhavy, 1974
• Troglostygnopsis inops(Goodnight & Goodnight, 1971)

• Joel Hallan's Biology Catalog:Stygnopsidae
• Kury, Adriano B. (2003): Annotated catalogue of the Laniatores of the New World (Arachnida, Opiliones).Revista Ibérica de Aracnología vol. especial monográfico1: 1-337.
• Pinto-da-Rocha, R., Machado, G. & Giribet, G. (eds.) (2007): Harvestmen - The Biology of Opiliones.Harvard University PressISBN 0-674-02343-9

• Harvestmen
• Harvestman families

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• Short description is different from Wikidata
• Articles using diversity taxobox
• Articles with 'species' microformats