type Drassus flavescens Walckenaer, 1830; gender feminine

N.B.: new name for Heterodictyna sensu Dahl, 1924: 154 (not Heterodictyna Dahl, 1904: 118).

Transferred to other genera:
Nigma gratiosa (Simon, 1881) -- see Ajmonia
Nigma numidica (Denis, 1937) -- see Ajmonia
Nigma patellaris (Simon, 1910) -- see Ajmonia
Nigma tristis (Spassky, 1952) -- see Dictyna

In synonymy:
Nigma canariensis Wunderlich, 1987 = Nigma puella (Simon, 1870) (Wunderlich, 1992a: 429).
Nigma eburnea (Schmidt, 1982, T from Dictyna) = Nigma puella (Simon, 1870) (Wunderlich, 1992a: 429).
Nigma lobensis (Schmidt, 1976, T from Dictyna) = Nigma puella (Simon, 1870) (Wunderlich, 1992a: 429).
Nigma orientalis (Kulczyński, 1895, T from Dictyna) = Nigma flavescens (Walckenaer, 1830) (Lehtinen, 1967: 252).
Nigma palmarum (Simon, 1885) = Nigma conducens (O. Pickard-Cambridge, 1876) (Simon, 1907e: 1, sub Dictyna).
Nigma vulnerata (Simon, 1914) = Nigma walckenaeri (Roewer, 1951) (Lecigne et al., 2022: 28).

Dictyna albida O. Pickard-Cambridge, 1885b: 29 (Df).
Dictyna albida Dyal, 1935: 157, pl. 14, f. 79 (f).
Nigma albida Esyunin & Sozontov, 2016: 202 (T from Dictyna).

Dictyna conducens O. Pickard-Cambridge, 1876b: 556, pl. 58, f. 3 (Dm).
Dictyna palmarum Simon, 1885i: 33 (Dmf) [urn:lsid:nmbe.ch:spidersp:059209].
Dictyna conducens Simon, 1907e: 1 (S of Dictyna palmarum).
Nigma conducens Lehtinen, 1967: 252, f. 329, 331 (mf, T from Dictyna).
"Nigma" conducens Esyunin, Zamani & Tuneva, 2017: 60 (incertae sedis, misplaced in the genus).
Nigma conducens Abdel-Ghani, Hassan & Sallam, 2023: 32, f. 6a-b (mf).

Drassus flavescens Walckenaer, 1830: 179 (Dmf).
Theridion viride Wider, 1834: 239, pl. 16, f. 11 (Dmf).
Dictyna variabilis C. L. Koch, 1836a: 29, f. 187 (Df).
Ergatis flavescens Blackwall, 1841a: 608.
Argus flavescens Walckenaer, 1847a: 501.
Ergatis pallens Blackwall, 1859a: 94 (Df).
Ergatis pallens Blackwall, 1861a: 145, pl. 10, f. 94 (f).
Dictyna variabilis Ohlert, 1867: 42 (Dm).
Dictyna flavescens Chyzer & Kulczyński, 1891: 158.
Dictyna orientalis Kulczyński, 1895a: 34, pl. 1, f. 22-23 (Df).
Dictyna flavescens Becker, 1896: 214, pl. 14, f. 2 (f).
Dictyna flavescens Kulczyński, 1899: 330, pl. 6, f. 8-9 (m).
Dictyna flavescens Bösenberg, 1902: 241, pl. 22, f. 344 (mf).
Dictyna flavescens Simon, 1914: 51, 63, f. 101 (mf).
Dictyna flavescens Drensky, 1940: 181, f. 9b, 10 (mf).
Dictyna flavescens Locket & Millidge, 1951: 64, f. 28C-D, G, 27C (mf).
Dictyna flavescens Wiehle, 1953: 83, f. 175-178b (mf).
Dictyna flavescens Muller, 1956: 199, f. 3-4 (f).
Heterodictyna flavescens Chamberlin & Gertsch, 1958: 47 (Tmf from Dictyna, S).
Nigma flavescens Lehtinen, 1967: 252 (T from Heterodictyna, S of Dictyna orientalis).
Dictyna flavescens Loksa, 1969: 39, f. 24E, 27B-C, 30B-C (mf).
Nigma flavescens Roberts, 1985: 52, f. 15b (mf).
Dictyna flavescens Hu & Li, 1987a: 319, f. 3.1-2 (f).
Nigma flavescens Heimer & Nentwig, 1991: 380, f. 987 (mf).
Nigma flavescens Roberts, 1995: 86, f. (mf).
Nigma flavescens Roberts, 1998: 88, f. (mf).
Nigma flavescens Song, Zhu & Chen, 1999: 365, f. 215S-T (f).
Nigma flavescens Hu, 2001: 111, f. 29.1-2 (f).
Nigma flavescens Wunderlich, 2011: 313, f. 2, 5, 8, 10, 17 (m).
Nigma flavescens Lecigne, 2016d: 21, f. 9F-I (mf).
Nigma flavescens Russell-Smith, 2017: 16, f. 1, 2B (m).
Nigma flavescens Kuralt & Kostanjšek, 2019: 31, f. 6 (m).
Nigma flavescens Tilly & Tilly, 2019: 8, f. 7A-B (m).

Dictyna gertschi Berland & Millot, 1940: 152, f. 4 (Dmf).
Nigma gertschi Lehtinen, 1967: 252 (Tmf from Dictyna).

Dictyna hortensis Simon, 1870b: 296 (Dmf).
Dictyna hortensis Simon, 1914: 50, 63, f. 97, 99 (mf).
Heterodictyna hortensis Chamberlin & Gertsch, 1958: 47 (T from Dictyna).
Nigma hortensis Lehtinen, 1967: 252 (T from Heterodictyna).
Dictyna hortensis Barrientos & Ferrández, 1982: 84, f. 2A, 3A (m).
Nigma hortensis Wunderlich, 2011: 313, f. 19 (m).
Nigma hortensis Lissner, 2017b: 52, f. 1a-b, 2a-b (f).

Dictyna laeta Spassky, 1952: 202, f. 2 (Df).
Nigma walckenaeri Lehtinen, 1967: 252 (S, rejected by Brignoli, 1983c: 515).
Dictyna laeta Andreeva & Tystshenko, 1969: 378, f. 4a (Dm).
Dictyna laeta Andreeva, 1976: 24, f. 23 (m).
Nigma laeta Brignoli, 1983c: 515.
"Nigma" laeta Esyunin, Zamani & Tuneva, 2017: 55, f. 18-26, 29 (mf, incertae sedis, misplaced in the genus).

Heterodictyna linsdalei Chamberlin & Gertsch, 1958: 47, pl. 10, f. 8-13 (Dmf).
Heterodictyna linsdalei Lehtinen, 1967: 210 (may belong to Ajmonia or Dictynomorpha).
Heterodictyna linsdalei Roth, 1982: 15-2, f. 8-9 (mf).
Nigma linsdalei Brignoli, 1983c: 515 (Tmf from Heterodictyna=Mallos).
Heterodictyna linsdalei Roth, 1985: B11-3, f. 8-9 (mf).
Heterodictyna linsdalei Roth, 1994: 91, f. 8-9 (mf).
Nigma linsdalei Griswold et al., 2005: 21, f. 176A (m).
"Nigma" linsdalei Esyunin, Zamani & Tuneva, 2017: 60 (incertae sedis, misplaced in the genus).

Dictyna longipes Berland, 1914: 55, f. 12-18 (Dmf).
Dictyna longipes Caporiacco, 1949a: 325, f. 4 (mf).
Nigma longipes Lehtinen, 1967: 252 (Tmf from Dictyna).
"Nigma" longipes Esyunin, Zamani & Tuneva, 2017: 60 (incertae sedis, misplaced in the genus).

Dictyna nangquianensis Hu, 2001: 105, f. 25.1-2 (Df).
Nigma nangquianensis Esyunin & Sozontov, 2016: 202 (T from Dictyna).

Dictyna puella Simon, 1870b: 299 (Df).
Dictyna puella Simon, 1874a: 180, pl. 3, f. 4 (f).
Dictyna puella Kulczyński, 1899: 330, pl. 6, f. 7, 10 (f, Dm).
Dictyna puella Simon, 1914: 51, 64, f. 98-99 (mf).
Dictyna puella Locket & Millidge, 1951: 64, f. 23B, 26A-B, E, 27A (mf).
Heterodictyna puella Chamberlin & Gertsch, 1958: 47 (Tmf from Dictyna).
Nigma puella Lehtinen, 1967: 252 (Tmf from Heterodictyna).
Dictyna lobensis Schmidt, 1976: 321, f. 4 (Df).
Dictyna eburnea Schmidt, 1982: 394, f. 2 (Df).
Nigma puella Roberts, 1985: 52, f. 15a (mf).
Nigma canariensis Wunderlich, 1987a: 226, f. 593-596a (Dmf).
Nigma puella Heimer & Nentwig, 1991: 380, f. 988 (m).
Nigma puella Wunderlich, 1992a: 429 (S).
Nigma puella Millidge, 1993c: 154, f. 55 (f).
Nigma puella Roberts, 1995: 86, f. (mf).
Nigma puella Roberts, 1998: 88, f. (mf).
Nigma puella Wunderlich, 2011: 313, f. 4, 6, 9, 13, 18 (m).
Nigma puella Russell-Smith, 2017: 17, f. 2A (m).
Nigma puella Breitling, 2020: 342, f. 7C (f).

Dictyna shiprai Tikader, 1966d: 46, f. 2a-c (Dmf).
Dictyna rebai Tikader, 1966d: 45, f. 1c (Dm; not f,=Anaxibia r.).
Nigma shiprai Lehtinen, 1967: 252 (Tmf from Dictyna).

Nigma tuberosa Wunderlich, 1987a: 227, f. 597-601 (Dmf).
Nigma tuberosa Wunderlich, 2011: 313, f. 14-15 (m).

Aranea viridissima Walckenaer, 1802: 212 (Dmf; preoccupied by De Geer, 1778).
Drassus viridissimus Walckenaer, 1805: 46.
Ergatis viridissima Blackwall, 1841a: 608.
Argus viridissimus Walckenaer, 1847a: 501.
Dictyna viridissima Simon, 1874a: 183.
Dictyna viridissima Bertkau, 1883: 379, pl. 11, f. 8 (f).
Dictyna viridissima Becker, 1896: 216, pl. 14, f. 3 (mf).
Dictyna viridissima Berland, 1913c: 34, f. 23-26 (mf).
Dictyna viridissima vulnerata Simon, 1914: 51, 63 (Df; suppressed for lack of usage, see ICZN article 23.9.3 and Lecigne et al., 2022: 28) [urn:lsid:nmbe.ch:spidersp:022519].
Dictyna viridissima Simon, 1914: 51, 63, f. 100 (mf).
Dictyna viridissima Gerhardt, 1921: 96, 173, f. 8 (m).
Dictyna viridissima Reimoser, 1932: 60, f. 5 (mf).
Dictyna viridissima Drensky, 1940: 181, f. 7, 9a (mf).
Dictyna viridissima Chrysanthus, 1949b: 352, f. 5 (m).
Dictyna viridissima Locket & Millidge, 1951: 64, f. 26C-D, F, 27B (mf).
Dictyna walckenaeri Roewer, 1951: 454 (replacement name).
Dictyna walckenaeri Wiehle, 1953: 76, f. 164-171b (mf).
Heterodictyna viridissima Chamberlin & Gertsch, 1958: 47 (T from Dictyna).
Nigma walckenaeri Lehtinen, 1967: 252 (T from Heterodictyna).
Dictyna viridissima Loksa, 1969: 39, f. 24F, 25, 27A, 30A, E (mf).
Nigma vulnerata Schmidt, 1973: 359 (elevated from subspecies).
Heterodictyna walckenaeri Locket, Millidge & Merrett, 1974: 2.
Dictyna viridissima Barrientos & Ferrández, 1982: 84, f. 2B, 3B (m).
Nigma walckenaeri Roberts, 1985: 52, f. 15c (mf).
Nigma walckenaeri Heimer & Nentwig, 1991: 380, f. 986 (mf).
Nigma walckenaeri Roberts, 1995: 87, f. (mf).
Nigma walckenaeri Roberts, 1998: 89, f. (mf).
Nigma walckenaeri Topçu, Demir & Seyyar, 2005: 124, f. 5 (m).
Nigma walckenaeri Wunderlich, 2011: 313, f. 3, 7, 11-12, 16 (m).
Nigma walckenaeri Allen, 2019: 29, f. 1-2 (m).
Nigma walckenaeri Lecigne et al., 2022: 27, f. 11A-D (m, S of Nigma vulnerata).
Nigma walckenaeri Seropian et al., 2023: 236, f. 8-9 (m).