Xystodesmidae Cook, 1895
Motyxia dissecta Causey & Tiemann nec Wood, 1967
Motyxia kerna Chamberlin, 1941
Motyxia monica Chamberlin, 1944
Motyxia pior Chamberlin, 1941
Motyxia porrecta Causey & Tiemann, 1969
Motyxia sequoia (Chamberlin, 1941)
Motyxia sequoiae (Loomis & Davenport, 1951)
Motyxia tiemanni Causey & Tiemann, 1969
Motyxia tularea (Chamberlin, 1949)
