N.B.: this spelling (rather than the invalid emendations Theridium Leach, 1824 and Theridio Simon, 1864), with type species T. pictum (Walckenaer, 1802), on Official List of Generic Names in Zoology; see also Opinion 517 (ICZN, 1958) – also for the type species; considered a senior synonym of Mastostigmus Simon, 1889b: 230 [urn:lsid:nmbe.ch:spidergen:06153] (type M. decemperlatus Simon, 1889) and Tobesoa Keyserling, 1890: 240 [urn:lsid:nmbe.ch:spidergen:06154] (type T. theridioides Keyserling, 1890) by Simon, 1894a: 550 (other synonyms see below and note under Neottiura); considered a senior synonym of Allotheridion Archer, 1946: 41 [urn:lsid:nmbe.ch:spidergen:04614] (type T. murarium Emerton, 1882; described as a subgenus of T. but elevated to genus by Archer, 1950: 18) by Levi, 1957a: 19, of Phaetoticus Simon, 1894a: 552 [urn:lsid:nmbe.ch:spidergen:05707] (type P. modestus Simon, 1894) by Levi & Levi, 1962: 26, of Billima Simon, 1908d: 430 [urn:lsid:nmbe.ch:spidergen:05706] (type B. attrita Simon, 1908; transferred from the Theridiosomatidae) by Levi, 1968c: 340, and of Liger O. Pickard-Cambridge, 1896a: 210 [urn:lsid:nmbe.ch:spidergen:01058] (type L. incompta O. Pickard-Cambridge, 1896) by Miller, 2007a: 247 (contra Levi & Levi, 1962: 301, who placed that genus in the Linyphiidae); subgenera Cryptachaea Archer, 1946 and Parasteatoda Archer, 1946 now considered valid genera, subgenus Tholocco Archer, 1946 belongs to Thymoites Keyserling, 1884; not a senior synonym of Coleosoma O. Pickard-Cambridge, 1882 (Bryant, 1944: 51, contra Simon, 1894a: 550), Anelosimus Simon, 1891 (Levi, 1956b: 412, contra Simon, 1894a: 550), Chrysso O. Pickard-Cambridge, 1882 (Levi, 1957c: 59, contra Simon, 1894a: 550), Phyllonethis Thorell, 1869 (contra Simon, 1894a: 550), Sudabe Karsch, 1879, Faitidus Keyserling, 1884 (contra Simon, 1894a: 550) or Hubba O. Pickard-Cambridge, 1897 (Levi & Levi, 1962: 21-29), of Nesticodes Archer, 1950, Paidiscura Archer, 1950, or Rugathodes Archer, 1950 (Wunderlich, 1987a: 213), or of Wamba O. Pickard-Cambridge, 1896 (removed from S of Crustulina Menge, 1868 by Levi, 1959b: 112), Allodipoena Bryant, 1947 or Chindellum Archer, 1950 (Wunderlich, 1995n: 611, contra Levi, 1957a: 19); for a rejected transfer of T. virgulatum Nicolet, 1849, see Lycosa fernandezi.