type Theridion pictipes Keyserling, 1884; gender feminine

N.B.: described as a subgenus of Allotheridion Archer, 1946 (synonymized with Theridion Walckenaer, 1805 by Levi, 1957a: 19); elevated to genus by Wunderlich, 2008b: 393.

In synonymy:
Phylloneta alpina (Giebel, 1867, T from Zygiella) = Phylloneta sisyphia (Clerck, 1757) (Levi, 1974a: 270, sub Theridion).
Phylloneta botezati (Roșca, 1935) = Phylloneta impressa (L. Koch, 1881) (Drensky, 1939a: 85, sub Theridion cornutum).
Phylloneta cincta (Walckenaer, 1841, T from Linyphia) = Phylloneta sisyphia (Clerck, 1757) (Walckenaer, 1847a: 485, sub Aranea notata).
Phylloneta cornuta (Yurinich & Drensky, 1917) = Phylloneta impressa (L. Koch, 1881) (Deltshev, 1992a: 17, sub Theridion).
Phylloneta frigicola (Chamberlin & Ivie, 1947) = Phylloneta impressa (L. Koch, 1881) (Levi, 1957a: 89, sub Theridion).
Phylloneta impressa intermedia (Kulczyński, 1885) = Phylloneta impressa (L. Koch, 1881) (Chyzer & Kulczyński, 1894: 33, sub Theridium).
Phylloneta nervosa (Olivier, 1789) = Phylloneta sisyphia (Clerck, 1757) (C. L. Koch, 1841a: vol. 8: 73, sub Theridium sisyphus).
Phylloneta notata (Linnaeus, 1758) = Phylloneta sisyphia (Clerck, 1757) (ICZN, 1959: 89).
Phylloneta qingzangensis (Hu, 2001, T from Theridion) = Phylloneta impressa (L. Koch, 1881) (Zhong, Liu & Zhu, 2022: 98).
Phylloneta sisyphia illepida (Caporiacco, 1934) = Phylloneta sisyphia torandae (Strand, 1917) (Bonnet, 1959: 4532, sub Theridium sisyphium torandae).

Homonym replaced:
Phylloneta lepida (O. Pickard-Cambridge, 1885) -- see Phylloneta sisyphia torandae (see Strand, 1917c)

Steatoda sisyphia Menge, 1868: 161, pl. 30, f. 69 (mf, misidentified per Simon, 1914: 295).
Theridion sisyphum Simon, 1881a: 100 (partly misidentified per Simon, 1914: 295).
Theridion impressum L. Koch, 1881b: 45, pl. 2, f. 1 (Dm).
Theridium impressum intermedium Kulczyński, 1885: 27 (Df) [urn:lsid:nmbe.ch:spidersp:062523].
Theridium impressum Chyzer & Kulczyński, 1894: 33, pl. 1, f. 26 (m, Df, S of Theridion impressum intermedium).
Theridion impressum Bösenberg, 1902: 99, pl. 9, f. 111 (mf).
Theridion impressum Fedotov, 1912a: 61, f. 1 (m).
Theridion impressum Simon, 1914: 257, 295, f. 509, 512-513 (mf).
Theridion cornutum Yurinich & Drensky, 1917: 116, 136, pl. 1, f. 1-3 (Dj; preoccupied by Wider, 1834, see Walckenaeria acuminata) [urn:lsid:nmbe.ch:spidersp:062524].
Theridion botezati Roșca, 1935: 243, f. 3 (Dmf) [urn:lsid:nmbe.ch:spidersp:055353].
Theridion botezati Roșca, 1936a: 198, f. 5 (mf).
Theridion impressum Wiehle, 1937: 152, f. 81-84 (mf).
Theridion cornutum Drensky, 1939a: 85, f. 1a-b (f, S of Theridion botezati).
Theridion impressum Nakatsudi, 1942b: 9, f. 1C (f).
Theridion frigicola Chamberlin & Ivie, 1947b: 27, f. 14-15 (Dmf) [urn:lsid:nmbe.ch:spidersp:055354].
Allotheridion impressum Archer, 1950: 20 (T from Theridion).
Theridion impressum Locket & Millidge, 1953: 67, f. 44C-D (mf).
Theridion impressum Levi, 1957a: 89, f. 321, 326-328 (mf, S of Theridion frigicola).
Theridion impressum Azheganova, 1968: 58, f. 101, 112 (mf).
Theridion impressum Tystshenko, 1971: 150, f. 401, 426 (mf).
Theridion impressum Miller, 1971: 194, pl. XXXV, f. 4-5 (mf).
Theridion impressum Izmailova, 1972b: 44, f. 2 (f).
Theridion impressum Palmgren, 1974b: 18, f. 4.1-4 (mf).
Theridion impressum Punda, 1975b: 64, f. 137-138 (f).
Theridion impressum Legotai & Sekerskaya, 1982: 50, f. III.22, 24 (mf).
Theridion impressum Müller, 1982a: 248, f. 4 (f).
Theridion impressum Roberts, 1985: 184, f. 81e (mf).
Theridion impressum Legotai & Sekerskaya, 1989: 224, f. LXIX.22, 24 (mf).
Theridion impressum Heimer & Nentwig, 1991: 302, f. 808 (mf).
Theridion impressum Deltshev, 1992a: 17 (S of Theridion cornutum Yurinich & Drensky, 1917).
Theridion impressum Roberts, 1995: 282, f. (mf).
Theridion impressum Mcheidze, 1997: 192, f. 388-391 (mf).
Theridion impressum Bellmann, 1997: 68, f. (f).
Theridion impressum Zhu, 1998: 161, f. 100A-E (mf).
Theridion impressum Roberts, 1998: 296, f. (mf).
Theridion impressum Song, Zhu & Chen, 1999: 138, f. 74A-B, K-L (mf).
Theridion impressum Hu, 2001: 580, f. 393.1-4 (mf).
Theridion qingzangensis Hu, 2001: 586, f. 398.1-5 (Df) [urn:lsid:nmbe.ch:spidersp:037539].
Theridion impressum Almquist, 2006: 99, f. 121a-h (mf).
Theridion impressum Paquin & Dupérré, 2006: 27, f. 74-79 (mf).
Phylloneta impressa Wunderlich, 2008b: 393, f. 554-557 (m).
Theridion impressum Le Peru, 2011: 478, f. 823 (mf).
Phylloneta impressa Kaya & Ugurtas, 2011: 148, f. 10-11 (mf).
Phylloneta impressa Quasin & Uniyal, 2012: 59, f. 1-2, 3a-c (f).
Phylloneta impressa Tilly & Tilly, 2019: 8, f. 7A-B (m).
Phylloneta impressa Vanuytven, 2021: 43, 233, f. A.32c, B.244 (m).
Phylloneta impressa Zhong, Liu & Zhu, 2022: 98, f. 2A-D, 3A-E (mf, S of Theridion qingzangense).
Phylloneta impressa Zhang, Peng & Zhang, 2022: 41, f. 21A-G (mf).

Theridion pictipes Keyserling, 1884a: 64, pl. 3, f. 38 (Df).
Allotheridion (Phylloneta) pictipes Archer, 1950: 19 (T from Theridion).
Theridion pictipes Levi, 1957a: 77, f. 270, 278-279, 294-295 (Dm, f).
Phylloneta pictipes Wunderlich, 2008b: 393 (T from Theridion).

Araneus sisyphius Clerck, 1757: 54, pl. 3, f. 5 (Df).
Aranea notata Linnaeus, 1758: 621 (D) [urn:lsid:nmbe.ch:spidersp:055355].
Aranea nervosa Olivier, 1789: 210 (D) [urn:lsid:nmbe.ch:spidersp:062530].
Araneus sisyphius Martyn, 1793: 24, pl. 4, f. 4 (f).
Aranea scopulorum Schrank, 1803: 241 (here per C. L. Koch, 1841a: vol. 8: 73; not Aranea scopulorum Fabricius, 1779, see Segestria senoculata).
Theridion nervosum Walckenaer, 1805: 74.
Theridion sisyphus Sundevall, 1831: 8, 1832: 115 (Dm).
Theridion sisyphum Hahn, 1834: 47, f. 132 (mf).
Theridion nervosum Hahn, 1834: 48, f. 133 (Dmf).
Linyphia cincta Walckenaer, 1841: 279 (D) [urn:lsid:nmbe.ch:spidersp:062531].
Theridium sisyphus C. L. Koch, 1841a: vol. 8: 73, f. 644 (m, S of Theridion nervosum).
Aranea notata Walckenaer, 1847a: 485 (S of Linyphia cincta).
Steatoda sisyphus C. L. Koch, 1850: 17.
Theridion nervosum Blackwall, 1864a: 183, pl. 13, f. 116 (mf).
Zilla alpina Giebel, 1867b: 434 (Df) [urn:lsid:nmbe.ch:spidersp:055352].
Theridion sisyphium Thorell, 1870a: 86.
Theridion sisyphium Hansen, 1882: 34, pl. 2, f. 10 (mf).
Theridion sisyphum Chyzer & Kulczyński, 1894: 33, pl. 1, f. 25 (mf).
Theridion sisyphum Becker, 1896: (2): 99, pl. 22, f. 1 (mf).
Theridion sisyphium Smith, 1900b: 206, p. 207, f. 1a (m).
Theridion sisyphum Bösenberg, 1902: 98, pl. 8, f. 118 (mf).
Theridion sisyphium Engelhardt, 1910: 74, f. 26 (f).
Theridion nervosum Fedotov, 1912a: 62, f. 2 (f).
Theridion sisyphum Simon, 1914: 257, 295, f. 509-511 (mf).
Theridion notatum Wiehle, 1937: 151, f. 76-80 (mf).
Theridion sisyphium Locket & Millidge, 1953: 66, f. 44A-B, 45A (mf).
Linyphia cincta Roewer, 1955c: 1542 (nicht zu deuten = nomen dubium).
Zygiella alpina Bonnet, 1959: 4998 (T from Zilla).
[Theridion sisyphium] ICZN, 1959: 89 (S of Theridion notatum, Clerckian names validated).
Theridium sisyphium Bonnet, 1959: 4530 (S of Linyphia cincta confirmed).
Theridion sisyphium Tystshenko, 1971: 147, f. 402, 425 (mf).
Theridion sisyphium Miller, 1971: 194, pl. XXXV, f. 2-3 (mf).
Theridion sisyphium Levi, 1974a: 270 (S of Zygiella alpina).
Theridion sisyphium Palmgren, 1974b: 19, f. 4.5-7 (mf).
Theridion sisyphium Punda, 1975b: 64, f. 135-136 (f).
Theridion sisyphium Roberts, 1985: 184, f. 81d (mf).
Theridion sisyphium Hu & Li, 1987a: 340, f. 18.1-2, 19.1-3 (mf).
Theridion sisyphius Hu & Wu, 1989: 138, f. 111.1-4 (mf).
Theridion sisyphium Heimer & Nentwig, 1991: 302, f. 809 (mf).
Theridion sisyphius Zhao, 1993: 219, f. 99a-c (mf).
Theridion sisyphium Roberts, 1995: 282, f. (mf).
Theridion sisyphius Zhao, 1995: 937, f. 438a-c (mf).
Theridion sisyphium Mcheidze, 1997: 192, f. 385-387 (f).
Theridion sisyphium Bellmann, 1997: 68, f. (f).
Theridion sisyphium Zhu, 1998: 166, f. 104A-E (mf).
Theridion sisyphium Roberts, 1998: 295, f. (mf).
Theridion sisyphium Song, Zhu & Chen, 1999: 142, f. 80A-B, I-J (mf).
Theridion sisyphium Hu, 2001: 586, f. 397.1-3 (mf).
Theridion sisyphium Almquist, 2006: 103, f. 126a-g (mf).
Theridion sisyphium Agnarsson, Coddington & Knoflach, 2007: 381, f. 169-172, 188 (m).
Phylloneta sisyphia Wunderlich, 2008b: 393, f. 558-562 (m).
Theridion sisyphium Le Peru, 2011: 485, f. 850 (mf).
Phylloneta sisyphia Jin, 2018: 28, f. 4-18.A-D, pl. 6 (m).
Phylloneta sisyphia Breitling, 2020: 357, f. 35F (m).

Theridion sisyphium foliiferum Thorell, 1875c: 49 (Df).

Theridion lepidum O. Pickard-Cambridge, 1885b: 32 (Dmf; preoccupied by Walckenaer, 1802, see Enoplognatha ovata) [urn:lsid:nmbe.ch:spidersp:062532].
Theridion torandae Strand, 1917c: 72 (replacement name).
Theridion sisyphium illepida Caporiacco, 1934a: 147 (superfluous replacement name, reduced to subspecies) [urn:lsid:nmbe.ch:spidersp:062533].
Theridium sisyphium torandae Bonnet, 1959: 4532 (S of Theridion sisyphium illepida).