In synonymy:
Hytanis Simon, 1893 = Xestaspis Simon, 1885 (Brescovit et al., 2019b: 8)

type Oonops loricatus L. Koch, 1873; gender feminine

N.B.: year of description corrected per Frétey, 2023: 126; Simon, 1885f: 324 fixed the type species, so the change to Xestaspis nitida Simon, 1885 by Simon, 1893a: 302 was invalid; considered a senior synonym of Hytanis Simon, 1893b: 440 [urn:lsid:nmbe.ch:spidergen:00520] (type H. oblonga Simon, 1893 = Xestaspis parmata Thorell, 1890) by Brescovit et al., 2019b: 8.

Transferred to other genera:
Xestaspis parumpunctata Simon, 1893 -- see Brignolia
Xestaspis reimoseri Fage, 1938 -- see Hexapopha

In synonymy:
Xestaspis bipeltis Thorell, 1895 = Xestaspis parmata Thorell, 1890 (Brescovit et al., 2019b: 6).
Xestaspis clypeata (Pavesi, 1875, T from Oonops) = Xestaspis loricata (L. Koch, 1873) (Brignoli, 1975d: 172, sub Gamasomorpha clypeata).
Xestaspis hyperion (Simon, 1890) = Xestaspis nitida Simon, 1885 (Simon, 1911b: 309).
Xestaspis insularis (Simon, 1907, T from Gamasomorpha) = Xestaspis parmata Thorell, 1890 (Brescovit et al., 2019b: 7).
Xestaspis lutzi (Petrunkevitch, 1929, T from Gamasomorpha) = Xestaspis parmata Thorell, 1890 (Brescovit et al., 2019b: 8).
Xestaspis madeirensis (Wunderlich, 1987) = Xestaspis parmata Thorell, 1890 (Saaristo, 2001a: 311, sub Gamasomorpha insularis).
Xestaspis oblonga (Simon, 1893, T from Hytanis) = Xestaspis parmata Thorell, 1890 (Brescovit et al., 2019b: 6).

Xestaspis biflocci Eichenberger, in Eichenberger et al., 2012: 56, f. 43A-H, 44A-H, 45A-E, 46A-H, 47A-C (Dmf).

Xestaspis kandy Eichenberger, in Eichenberger et al., 2012: 46, f. 35A-G, 36A-E, 37A-E (Dmf).
Xestaspis kandy Ranasinghe & Benjamin, 2016b: 64, f. 2A-B, 3A-H, 4A-H, 5A-B (mf).

Xestaspis linnaei Ott & Harvey, 2008a: 337, f. 1A-E, 2A-D, 3A-E (Dmf).

Oonops loricatus L. Koch, 1873: 449, pl. 35, f. 3 (Df).
Oonops clypeatus Pavesi, 1875: 126 (superfluous replacement name for Oonops loricatus L. Koch, 1873)  [urn:lsid:nmbe.ch:spidersp:058791].
Gamasomorpha loricata Berland, 1933b: 46, f. 6 (Dm).
Gamasomorpha loricata Roewer, 1963a: 119, f. 6a-d (mf).
Gamasomorpha clypeata Brignoli, 1975d: 172 (maintains that Oonops loricatus Simon, 1873 has priority over O. l. L. Koch, 1873).
Gamasomorpha loricata Saaristo, 2001a: 311, f. 1B, 2B, 3B (m).
Xestaspis loricata Tong & Li, 2009b: 26, f. 1G-I, 2G-I, 5A-D (mf).
Xestaspis loricata Tong, 2013: 51, f. 17G-I, 18G-I, 69A-D (mf).

Xestaspis nitida Simon, 1885f: 325 (Df).
Gamasomorpha hyperion Simon, 1890a: 88 (Df)  [urn:lsid:nmbe.ch:spidersp:058793].
Xestaspis hyperion Simon, 1893a: 302 (T from Gamasomorpha).
Xestaspis nitida Simon, 1911b: 309 (S of Xestaspis hyperion).
Xestaspis nitida Saaristo & van Harten, 2006: 152, f. 74-77 (Dm, f).
Xestaspis nitida Frétey, 2023: 126 (year of description corrected).

Xestaspis nuwaraeliya Ranasinghe & Benjamin, 2016b: 67, f. 7A-H, 8A-B (Dmf).

Xestaspis padaviya Ranasinghe & Benjamin, 2016b: 70, f. 9A-H, 10A-B (Dmf).

Xestaspis parmata Thorell, 1890a: 391 (Df).
Gamasomorpha paramata Simon, 1893a: 301 (lapsus).
Hytanis oblonga Simon, 1893b: 440 (Df) [urn:lsid:nmbe.ch:spidersp:004937].
Xestaspis bipeltis Thorell, 1895b: 16 (Dm) [urn:lsid:nmbe.ch:spidersp:004873].
Gamasomorpha insularis Simon, 1907d: 231 (Df) [urn:lsid:nmbe.ch:spidersp:004884].
Opopaea lutzi Petrunkevitch, 1929b: 61, f. 42-50 (Dm) [urn:lsid:nmbe.ch:spidersp:004895].
Gamasomorpha bipeltis Roewer, 1942a: 285.
Opopaea lutzi Chickering, 1969d: 153, f. 22-27 (m, Df).
Gamasomorpha lutzi Brignoli, 1975a: 228 (Tmf from Opopaea).
Gamasomorpha insularis Benoit, 1977b: 38, f. 14a-e (Dm).
Gamasomorpha madeirensis Wunderlich, 1987a: 66, f. 40-43 (Dmf) [urn:lsid:nmbe.ch:spidersp:004896].
Gamasomorpha insularis Saaristo, 2001a: 311, f. 1A, 2A, 3A, 4, 5A-B, 6-8 (mf, S of Gamasomorpha madeirensis).
Gamasomorpha insularis Saaristo & van Harten, 2006: 133, f. 4-7, 8a-b (m).
Gamasomorpha insularis Saaristo, 2010: 115, f. 22.1-8 (m).
Gamasomorpha lutzi Burger, 2011a: 149, f. 1C-E, 3F-H, 4A-B (mf).
Xestaspis parmata Brescovit et al., 2019b: 6, f. 15-19 (mf, T from Gamasomorpha, S of Gamasomorpha bipeltis, G. insularis, G. lutzi and Hytanis oblonga).
Xestaspis parmata Suzuki, Hidaka & Tatsuta, 2023: 221, f. 2A-P (mf).

Xestaspis paulina Eichenberger, in Eichenberger et al., 2012: 51, f. 38A-G, 39A-D, 40A-E (Dmf).

Xestaspis pophami Ranasinghe & Benjamin, 2016b: 73, f. 11A-H, 12A-B (Dmf).

Xestaspis recurva Strand, 1906b: 680 (Df).
Xestaspis recurva Strand, 1908l: 16, pl. 2, f. 18 (f).

Xestaspis rostrata Tong & Li, 2009b: 31, f. 1J-L, 2J-L, 6A-C (Dmf).
Xestaspis rostrata Tong, 2013: 52, f. 17J-L, 18J-L, 70A-C (mf).

Xestaspis semengoh Eichenberger, in Eichenberger et al., 2012: 53, f. 41A-H, 42A-H (Dmf).

Xestaspis sertata Simon, 1907d: 231 (Dmf).

Xestaspis shoushanensis Tong & Li, 2014: 81, f. 8A-K, 9A-J, 10A-C (Dmf).

Xestaspis sis Saaristo & van Harten, 2006: 154, f. 78-81, 82a-b (Dmf).

Xestaspis sublaevis Simon, 1893e: 305 (Df).

Xestaspis tumidula Simon, 1893e: 304 (Dmf).

Xestaspis yemeni Saaristo & van Harten, 2006: 155, f. 83-85, 86a-b (Dmf).