In synonymy:
Boreoechemus Lohmander, 1942 = Echemus Simon, 1878 (Tullgren, 1946: 111)

type Echemus ambiguus Simon, 1878; gender masculine; syn. of Echemus angustifrons (Westring, 1861)

N.B.: considered a senior synonym of Boreoechemus Lohmander, 1942: 114 [urn:lsid:nmbe.ch:spidergen:05501] (type Drassus angustifrons Westring, 1861) by Tullgren, 1946: 111.

Transferred to other genera:
Echemus argentinensis Mello-Leitão, 1942 -- see Echemoides
Echemus argentinus Mello-Leitão, 1940 -- see Echemoides
Echemus argentinus Mello-Leitão, 1941 -- see Echemoides
Echemus argutus Simon, 1902 -- see Camillina
Echemus babunaensis Drensky, 1929 -- see Zelotes
Echemus banksi Chickering, 1949 -- see Zimiromus
Echemus canariensis Simon, 1883 -- see Setaphis
Echemus chilensis Simon, 1902 -- see Camillina
Echemus fuscipes Simon, 1885 -- see Setaphis
Echemus giaii Gerschman & Schiapelli, 1948 -- see Almafuerte
Echemus griseus (L. Koch, 1873) -- see Encoptarthria
Echemus hamipalpis (Kroneberg, 1875) -- see Poecilochroa
Echemus incinctus Simon, 1907 -- see Hongkongia
Echemus iotus Banks, 1929 -- see Zimiromus
Echemus lubricus Simon, 1892 -- see Zimiromus
Echemus major Keyserling, 1891 -- see Camillina
Echemus medius Keyserling, 1891 -- see Zimiromus
Echemus minutus Mello-Leitão, 1941 -- see Camillina
Echemus mollis (O. Pickard-Cambridge, 1874) -- see Setaphis
Echemus montanus Chickering, 1949 -- see Zimiromus
Echemus ochraceus F. O. Pickard-Cambridge, 1899 -- see Scopoides
Echemus pallas Mello-Leitão, 1918 -- see Zimiromus
Echemus pampeanus Mello-Leitão, 1940 -- see Echemoides
Echemus pavesii Simon, 1897 -- see Camillina
Echemus pedestris O. Pickard-Cambridge, 1898 -- see Camillina
Echemus penicillatus Mello-Leitão, 1942 -- see Echemoides
Echemus pharetratus Karsch, 1881 -- see Setaphis
Echemus pulcher Keyserling, 1891 -- see Camillina
Echemus rangunensis (Thorell, 1895) -- see Micythus
Echemus relucens Simon, 1893 -- see Camillina
Echemus simplex Simon, 1885 -- see Setaphis
Echemus tener (Sørensen, 1904) -- see Drassyllus
Echemus tropicalis Banks, 1909 -- see Zimiromus

In synonymy:
Echemus ambiguus Simon, 1878 = Echemus angustifrons (Westring, 1861) (Platnick & Shadab, 1976e: 3).
Echemus angustifrons balticus (Lohmander, 1942) = Echemus angustifrons (Westring, 1861) (Lohmander, 1942: 115, sub Boreoechemus, provisional name).
Echemus napaeus (L. Koch, 1876, T from Zelotes) = Echemus angustifrons (Westring, 1861) (Thaler, 1981c: 113).
Echemus rhenanus Bertkau, 1883 = Echemus angustifrons (Westring, 1861) (Tullgren, 1946: 111).

Drassus angustifrons Westring, 1861: 349 (Dj).
Drassus angustifrons Thorell, 1871a: 185 (Dm).
Prosthesima napaea L. Koch, 1876b: 304 (Df).
Echemus ambiguus Simon, 1878a: 100, pl. 15, f. 1 (Dm).
Echemus rhenanus Bertkau, in Förster & Bertkau, 1883: 222, pl. 3, f. 1 (Dmf).
Echemus rhenanus Chyzer & Kulczyński, 1897: 209, pl. 8, f. 38, 44 (mf).
Echemus rhenanus Bösenberg, 1902: 301, pl. 28, f. 446 (mf).
Echemus ambiguus Simon, 1914: 150, 212, f. 276-277 (m, Df).
Echemus alberti Schenkel, 1925d: 282, f. 3 (Df).
Echemus rhenanus Reimoser, 1937a: 23, f. 54-55 (mf).
Echemus angustifrons Holm, 1940: 88.
Boreoechemus angustifrons Lohmander, 1942: 114 (Df).
Boreoechemus rhenanus Lohmander, 1942: 114.
Boreoechemus angustifrons balticus Lohmander, 1942: 115 (only provisional name) [urn:lsid:nmbe.ch:spidersp:027128].
Echemus angustifrons Tullgren, 1946: 111, pl. 18, f. 234-236 (mf, S).
Echemus rhenanus Hull, 1948: 62, f. 6 (f, probably misidentified).
Boreoechemus angustifrons Miller, 1971: 85, pl. VII, f. 19 (f).
Echemus angustifrons Platnick & Shadab, 1976e: 3, f. 1-4 (mf, S).
Echemus angustifrons Thaler, 1981c: 113 (S).
Echemus rhenanus Dunin, 1984a: 49, f. 9 (f).
Echemus angustifrons Grimm, 1985: 127, f. 139-145 (mf).
Echemus angustifrons Heimer & Nentwig, 1991: 420, f. 1106 (mf).
Echemus angustifrons Trotta, 2005: 165, f. 283-284 (mf).
Echemus angustifrons Almquist, 2006: 395, f. 340a-g (mf).
Echemus angustifrons Murphy, 2007: 50, f. 348-349 (mf).
Echemus angustifrons Kovblyuk et al., 2009: 177, f. 34-36, 38 (m).
Echemus angustifrons Akpınar et al., 2011: 16375, f. 2c (f).
Echemus angustifrons Chatzaki & Van Keer, 2019: 439, f. 9-12 (f).
Echemus angustifrons Höfer et al., 2019: 66, f. 11a-b (m).
Echemus angustifrons Bosmans & Gavalas, 2023: 26, f. 10H-J (mf).

Echemus caspicus Zamani et al., 2021a: 83, f. 9A-D (Df).

Drassus chaetognathus Thorell, 1887: 32 (Df).
Echemus chaetognathus Thorell, 1897a: 209.

Echemus chaperi Simon, 1885h: 22, pl. 10, f. 21 (Df).

Drassus chebanus Thorell, 1897a: 215 (Df).
Echemus chebanus Roewer, 1955c: 419.

Echemus chialanus Thorell, 1897a: 209 (Df).

Drassus dilutus L. Koch, 1873: 389, pl. 30, f. 6 (Dj).
Echemus dilutus Simon, 1893a: 367.

Echemus erutus Tucker, 1923: 350, pl. 9, f. 65 (Df).
Echemus erutus Dippenaar-Schoeman et al., 2021C: 4, 3 f. (f).

Echemus escalerai Simon, 1909b: 18 (Df).

Drassus ghecuanus Thorell, 1897a: 210 (Dm).
Echemus ghecuanus Roewer, 1955c: 419.

Echemus inermis Mello-Leitão, 1939h: 288, f. 5 (Dm).

Drassus interemptor O. Pickard-Cambridge, 1885b: 8, pl. 1, f. 5 (Dm).
Echemus interemptor Marusik & Omelko, 2019: 288, f. 1D, 2D, 3E-F, 4E-F, 5A (m, T from Drassodes; probably conspecific with Drassodes infletus).

Echemus kaltsasi Chatzaki, in Chatzaki & Van Keer, 2019: 439, f. 13-14, 17-18 (Df).

Echemus lacertosus Simon, 1907d: 233 (Df).

Echemus levyi Kovblyuk & Seyyar, in Kovblyuk et al., 2009: 177, f. 29-33, 37, 39-41 (Dm).
Echemus levyi Chatzaki & Van Keer, 2019: 440, f. 15-16, 19-20 (Df).
Echemus levyi Bosmans & Gavalas, 2023: 23, f. 10A-G (mf).

Echemus modestus Kulczyński, 1899: 352, pl. 6, f. 34-35 (Dmf).

Drassus orinus Thorell, 1897a: 212 (Df).
Echemus orinus Roewer, 1955c: 419.

Echemus pictus Kulczyński, 1911b: 467, pl. 21, f. 17, 19-20, 23 (Dmf).

Drassus plapoensis Thorell, 1897a: 216 (Df).
Echemus plapoensis Roewer, 1955c: 419.

Leptodrassus scutatus Simon, 1880j: 262 (Dj).
Echemus scutatus Dalmas, 1919b: 249 (T from Leptodrassus).

Echemus sibiricus Marusik & Logunov, 1995b: 186, f. 34-36 (Dm).

Echemus viveki Gajbe, 1989: 560, f. 9-13 (Df).