In synonymy:
Haemathyphantes Caporiacco, 1949 = Ostearius Hull, 1911 (van Helsdingen, 1977: 182)
Transferred to other genera:
Ostearius delli Forster, 1955 -- see Gasparia
In synonymy:
Ostearius analis (Simon, 1894, T from Oedothorax) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Wunderlich, 1976c: 140)
Ostearius arcuata (Tullgren, 1901, T from Oedothorax) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Holm, 1962: 187)
Ostearius atriventer (Urquhart, 1887, T from Erigone) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Millidge, 1985: 42)
Ostearius denisi (Caporiacco, 1949) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (van Helsdingen, 1977: 182)
Ostearius insulanus (Simon, 1900, T from Microneta) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (van Helsdingen, 1973c: 8)
Ostearius matei (Keyserling, 1886, T from Oedothorax) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Holm, 1962: 186)
Ostearius melacrus (Chamberlin, 1916, T from Scolopembolus) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Ivie, 1967: 129)
Ostearius melanura (Simon, 1908, T from Ceratinopsis) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Machado, 1982: 141)
Ostearius striaticeps (Keyserling, 1886, T from Erigone) = Ostearius melanopygius O. Pickard-Cambridge, 1880 (Miller, 2007a: 30)