type Nagaina incunda G. W. Peckham & E. G. Peckham, 1896; gender feminine

In synonymy:
Nagaina expallidata (F. O. Pickard-Cambridge, 1901, T from Metaphidippus) = Nagaina incunda G. W. Peckham & E. G. Peckham, 1896 (Maddison, 1996: 309).
Nagaina flavolineata (F. O. Pickard-Cambridge, 1901, T from Beata) = Nagaina incunda G. W. Peckham & E. G. Peckham, 1896 (Maddison, 1996: 309).
Nagaina vegeta (G. W. Peckham & E. G. Peckham, 1901, T from Metaphidippus) = Nagaina incunda G. W. Peckham & E. G. Peckham, 1896 (Maddison, 1996: 308).

Nomina dubia:
Nagaina modesta Caporiacco, 1954: 192, f. 75 (f, French Guiana) -- Ruiz & Brescovit, 2008c: 493.
Nagaina olivacea Franganillo, 1930: 41 (Cuba) -- Alayón & Sherwood, 2022: 612.

Nagaina berlandi Soares & Camargo, 1948a: 395, f. 61-66 (Df).

Nagaina diademata Simon, 1902d: 404 (Df).
Nagaina diademata Galiano, 1963a: 399, pl. XXVII, f. 13 (f).

Nagaina incunda Peckham & Peckham, 1896: 55, pl. 4, f. 10 (Df).
Dendryphantes vegetus Peckham & Peckham, 1901a: 323, pl. 28, f. 7 (Df) [urn:lsid:nmbe.ch:spidersp:055242].
Metaphidippus flavolineatus F. O. Pickard-Cambridge, 1901a: 268, pl. 24, f. 9 (Dm) [urn:lsid:nmbe.ch:spidersp:055241].
Metaphidippus expallidatus F. O. Pickard-Cambridge, 1901a: 270, pl. 24, f. 18 (Df) [urn:lsid:nmbe.ch:spidersp:055240].
Metaphidippus vegetus F. O. Pickard-Cambridge, 1901a: 273.
Nagaina incunda F. O. Pickard-Cambridge, 1901a: 298, pl. 29, f. 4 (f).
Beata flavolineata Simon, 1903a: 838.
Nagaina incunda Simon, 1903a: 859, f. 1011.
Dendryphantes expallidatus Petrunkevitch, 1911: 629.
Metaphidippus vegetus Prószyński, 1971e: 434 (T from Dendryphantes, per Roewer).
Metaphidippus expallidatus Prószyński, 1990: 217 (T from Dendryphantes).
Nagaina incunda Maddison, 1996: 308, f. 174-175, 228, 488-492 (mf, S of Beata flavolineata, Metaphidippus expallidatus and M. vegetus).
Nagaina incunda Prószyński, 2017b: 94, f. 42M (mf).

Nagaina tricincta Simon, 1902d: 404 (Df).
Nagaina tricincta Galiano, 1963a: 399, pl. XXVII, f. 10 (f).