type Metopobactrus falcifrons Simon, 1884; gender masculine

Transferred to other genera:
Metopobactrus brunneipes Dahl, 1912 -- see Abacoproeces
Metopobactrus fatrensis (Miller, 1966) -- see Sauron
Metopobactrus pacificus Emerton, 1923 -- see Micrargus
Metopobactrus pilipes Kulczyński, 1908 -- see Lasiargus
Metopobactrus rayi (Simon, 1882) -- see Sauron
Metopobactrus tibialis Heimer, 1987 -- see Silometopoides

In synonymy:
Metopobactrus alticeps (Emerton, 1909, T from Maso) = Metopobactrus prominulus (O. Pickard-Cambridge, 1873) (Buckle et al., 2001: 132).
Metopobactrus schenkeli Thaler, 1976 = Metopobactrus prominulus (O. Pickard-Cambridge, 1873) (Muff et al., 2007: 20).
Metopobactrus territus (O. Pickard-Cambridge, 1907, T from Microneta) = Metopobactrus prominulus (O. Pickard-Cambridge, 1873) (Simon, 1926: 489).

Nomen dubium:
Metopobactrus triangulatus Strand, 1902: 19, f. 1 (f, Norway) -- Aakra, 2002: 269.

Abacoproeces ascitus Kulczyński, in Chyzer & Kulczyński, 1894: 119, pl. 4, f. 42 (Dm).
Abacoproeces ascitus Miller, 1944: 13, f. 1-3, 7 (m, Df).
Abacoproeces ascitus Miller, 1971: 258, pl. LII, f. 23-26 (mf).
Metopobactrus ascitus Thaler, 1976a: 232 (T from Abacoproeces).
Abacoproeces ascitus Millidge, 1977: 25, f. 90 (m).
Metopobactrus ascitus Tanasevitch, 2023f: 521, f. 1-2, 4-10 (m).

? Metopobactrus cavernicolus Wunderlich, 1992a: 389, f. 451-452 (Dj).
Metopobactrus cavernicola Wunderlich, 2011: 374 (may belong to Walckenaeria).

Metopobactrus cornis Seo, 2018: 262, f. 5H, 8J-M (Dm).

Metopobactrus deserticolus Loksa, 1981b: 336, f. 15-18 (Dmf).
Metopobactrus deserticola Szita et al., 1998: 342, f. 3-8 (mf).
Metopobactrus deserticola Gajdoš, Černecká & Šestáková, 2019: 59, f. 20-26 (mf).

Metopobactrus falcifrons Simon, 1884a: 719, f. 589-590 (Dmf).
Metopobactrus falcifrons Simon, 1894a: 657, f. 663, 680 (m).
Metopobactrus falcifrons Simon, 1926: 357, 359, 489, f. 632-633 (mf).
Metopobactrus falcifrons Thaler, 1976a: 230, f. 17, 40 (f).
Thaumatoncus indicator Barrientos, Uribarri & García-Sarrión, 2014: 5, f. 2 (m; misidentified per Barrientos, 2020: 238).
Metopobactrus falcifrons del Mar Jiménez Segura, Morano & Méndez Iglesias, 2017: 100, f. 2A-B (m).

Metopobactrus nadigi Thaler, 1976a: 234, f. 25, 27-29, 33, 35 (Dm).
Metopobactrus nadigi Hänggi, 1989: 171, f. 3a-b (Df).
Metopobactrus nadigi Heimer & Nentwig, 1991: 214, f. 576 (m).
Metopobactrus nadigi Pesarini, 1996: 423, f. 40-41 (m).

Metopobactrus nodicornis Schenkel, 1927b: 239, f. 4 (Dm).
Metopobactrus nodicornis Thaler, 1976a: 236, f. 8-16, 18-20, 39 (m, Df).
Metopobactrus nodicornis Heimer & Nentwig, 1991: 212, f. 574 (mf).

Metopobactrus orbelicus Deltshev, 1985a: 363, f. 20-27 (Dmf).

Erigone prominula O. Pickard-Cambridge, 1873a: 750, pl. 65, f. 4 (Dm).
Walckenaera prominula O. Pickard-Cambridge, 1881a: 448.
Lophocarenum prominulum Förster & Bertkau, 1883: 235, pl. 3, f. 3 (m).
Metopobactrus prominulus Simon, 1884a: 723, f. 596-597 (m, Df).
Metopobactrus prominulus Smith, 1901a: 304, p. 334: f. 1p, 2m (m).
Metopobactrus prominulus Bösenberg, 1902: 209, pl. 18, f. 294 (m).
Microneta territa O. Pickard-Cambridge, 1907: 77, 88, pl. 27, f. 19-21 (Df) [urn:lsid:nmbe.ch:spidersp:062897].
Caseola alticeps Emerton, 1909: 187, pl. 2, f. 2 (Dm) [urn:lsid:nmbe.ch:spidersp:011529].
Metopobactrus prominulus Simon, 1926: 358, 489, f. 638-639 (mf, S of Microneta territa).
Metopobactrus prominulus Schenkel, 1927b: 241, f. 5 (m).
Araeoncus alticeps Petrunkevitch, 1929a: 522 (Df).
Maso alticeps Bishop & Crosby, 1935c: 231, pl. 19, f. 29-32 (m).
Metopobactrus prominulus Miller, 1947: 38, pl. VI, f. 11 (f).
Maso alticeps Kaston, 1948: 145, f. 341-345 (m).
Metopobactrus prominulus Locket & Millidge, 1953: 227, f. 138F-I (mf).
Metopobactrus prominulus Tullgren, 1955: 343, f. 46a-f (mf).
Metopobactrus prominulus Wiehle, 1960a: 246, f. 446-451 (mf).
Metopobactrus prominulus Merrett, 1963b: 414, f. 90A-C (m).
Metopobactrus prominulus Tystshenko, 1971: 248, f. 878, 881 (mf).
Metopobactrus prominulus Miller, 1971: 264, pl. LIX, f. 27-28 (mf).
Metopobactrus prominulus Palmgren, 1976: 78, f. 9.1-5 (mf).
Metopobactrus prominulus Thaler, 1976a: 232, f. 21-22, 26, 30-32, 34, 36-38, 42 (mf).
Metopobactrus schenkeli Thaler, 1976a: 240, f. 23-24, 41, 58-65 (Dmf) [urn:lsid:nmbe.ch:spidersp:011773].
Metopobactrus prominulus Millidge, 1977: 25, f. 89 (m).
Metopobactrus prominulus Roberts, 1987: 46, f. 14c, 17c (mf).
Metopobactrus prominulus Tanasevitch, 1990: 54, f. 16.9-11, 24.53 (mf).
Metopobactrus prominulus Saito & Yasuda, 1990: 11, f. 1-6 (mf).
Metopobactrus prominulus Heimer & Nentwig, 1991: 214, f. 575 (mf).
Metopobactrus prominulus Buckle et al., 2001: 132 (S of Maso alticeps).
Metopobactrus prominulus Paquin & Dupérré, 2003: 115, f. 1179-1182 (mf).
Metopobactrus prominulus Muff et al., 2007: 20, f. 4a-f (S of Metopobactrus schenkeli).
Metopobactrus prominulus Ono, Matsuda & Saito, 2009: 270, f. 137-143 (mf).
Metopobactrus prominulus Marusik, 2015: 689, f. 11M-N (f).
Metopobactrus prominulus Crespo et al., 2018: 166, f. 7a-h (mf, new male dimorphism).
Metopobactrus prominulus f. schenkeli Breitling, 2020: 347, f. 18C-D (m).

Erigone verticalis Simon, 1882d: 248 (Dm).
Metopobactrus verticalis Simon, 1884a: 722, f. 593-595 (m).
Metopobactrus verticalis Simon, 1894a: 614, f. 659 (m).
Metopobactrus verticalis Simon, 1926: 359, 489, f. 635-637 (m, Df).
Metopobactrus verticalis IJland & van Helsdingen, 2014: 22, f. 10-12 (m).
Erigone verticalis Frétey, 2023: 124 (year of description corrected).