In synonymy:
Hormathion Crosby & Bishop, 1933 = Thyreosthenius Simon, 1884 (Hackman, 1952b: 73)
Transferred to other genera:
Thyreosthenius asiaticus Andreeva & Tystshenko, 1970 -- see Styloctetor
In synonymy:
Thyreosthenius becki (O. Pickard-Cambridge, 1871) = Thyreosthenius parasiticus (Westring, 1851) (Holm, 1945b: 20)
Thyreosthenius buddebergi (Bösenberg, 1899, T from Diplocephalus) = Thyreosthenius biovatus (O. Pickard-Cambridge, 1875) (Wunderlich, 1974b: 165)
Thyreosthenius limnatus (Crosby & Bishop, 1933, T from Hormathion) = Thyreosthenius parasiticus (Westring, 1851) (Hackman, 1952b: 73)
Thyreosthenius sulcatus (Simon, 1926, T from Troxochrus) = Thyreosthenius parasiticus (Westring, 1851) (Millidge, 1977: 56)
Thyreosthenius synophrys (Thorell, 1870, T from Erigone) = Thyreosthenius parasiticus (Westring, 1851) (Simon, 1926: 499, sub Thyreosthenius becki)