type Erigone aquilonaris L. Koch, 1879; gender neuter

Transferred to other genera:
Hybauchenidium mongolense Heimer, 1987 -- see Oedothorax

In synonymy:
Hybauchenidium dentipalpis (Emerton, 1915) = Hybauchenidium gibbosum (Sørensen, 1898) (Holm, 1967: 37, sub Hybocoptus, S possibly rejected by Holm, 1973: 86).
Hybauchenidium holmi Marusik, 1988 = Hybauchenidium aquilonare (L. Koch, 1879) (Tanasevitch, 2010e: 276).
Hybauchenidium polaris (Keyserling, 1886, T from Erigone) = Hybauchenidium aquilonare (L. Koch, 1879) (Holm, 1970: 194, sub Hybocoptus).
Hybauchenidium prodigiale (Holm, 1945) = Hybauchenidium ferrumequinum (Grube, 1861) (Eskov & Marusik, 1994: 67).
Hybauchenidium septentrionale (Kulczyński, 1908, T from Gongylidium) = Hybauchenidium aquilonare (L. Koch, 1879) (Holm, 1960b: 120, sub Hybocoptus).
Hybauchenidium wamotsus (Chamberlin, 1919, T from Diplocephalus) = Hybauchenidium gibbosum (Sørensen, 1898) (Crosby & Bishop, 1933b: 157, sub Hybocoptus dentipalpis).

Erigone aquilonaris L. Koch, 1879c: 42, pl. 1, f. 29 (Dmf).
Erigone polaris Keyserling, 1886b: 148, pl. 16, f. 215 (Dm) [urn:lsid:nmbe.ch:spidersp:054312].
Gongylidium septentrionale Kulczyński, 1908b: 14, pl. 1, f. 18 (Df) [urn:lsid:nmbe.ch:spidersp:054314].
Tapinocyba aquilonaris Grese, 1909: 327, pl. 7, f. 3 (m).
Oedothorax aquilonaris Dahl, 1928: 22, f. 33-35 (f).
Gongylidium septentrionale Chamberlin & Ivie, 1947b: 43, f. 39 (f).
Erigone polaris Roewer, 1955c: 1500 (nicht zu deuten = nomen dubium).
Hybocoptus aquilonaris Holm, 1960b: 120 (T from Oedothorax, S of Gongylidium septentrionale).
Hybocoptus aquilonaris Holm, 1970: 194, f. 11 (m, S of Erigone polaris, removed from nomen dubium).
Hybauchenidium aquilonare Holm, 1973: 85, f. 38-45 (mf, T from Hybocoptus).
Hybauchenidium aquilonare Marusik, 1988b: 1914, f. 1.5-9 (mf).
Hybauchenidium holmi Marusik, 1988b: 1914, f. 1.1-4 (Dmf) [urn:lsid:nmbe.ch:spidersp:010849].
Hybauchenidium aquilonare Tanasevitch, 2010e: 276, f. 12-22 (m, S of Hybauchenidium holmi).

Hybocoptus cymbadentatus Crosby & Bishop, 1935: 125, f. 1-4 (Dmf).
Hybauchenidium cymbadentatum Crawford, 1988: 18 (T from Hybocoptus).
Hybauchenidium cymbadentatum Paquin & Dupérré, 2003: 111, f. 1130-1133 (mf).

Micryphantes ferrum-equinum Grube, 1861: 168 (Dmf).
Hybocoptus prodigialis Holm, 1945b: 35, f. 9a-f (Dmf) [urn:lsid:nmbe.ch:spidersp:054313].
Micryphantes ferrumequinum Roewer, 1955c: 1589 (nicht zu deuten = nomen dubium).
Hybauchenidium prodigialis Holm, 1973: 86 (T from Hybocoptus).
Hybauchenidium prodigialis Palmgren, 1976: 74, f. 5.13-16 (mf).
Hybauchenidium ferrumequinum Eskov & Marusik, 1994: 67 (T from Micryphantes, removed from nomen dubium, S of Hybauchenidium prodigialis).

Minicia gibbosa Sørensen, 1898: 216 (Dmf).
Lophocarenum dentipalpis Emerton, 1915b: 149, pl. 2, f. 9 (Dm) [urn:lsid:nmbe.ch:spidersp:054311].
Gongylidium tuberosum Emerton, 1915b: 150 (f only; not m lectotype, = Oreonetides vaginatus, per Holm, 1945b: 45 and Hackman, 1954: 5).
Diplocephalus wamotsus Chamberlin, 1919a: 251, pl. 18, f. 6-7 (Dmf) [urn:lsid:nmbe.ch:spidersp:054315].
Hybocoptus dentipalpis Crosby & Bishop, 1933b: 157, pl. 8, f. 186-193 (mf, S of Diplocephalus wamotsus).
Hybocoptus denticulatus Hackman, 1954: 65, f. 68 (f, lapsus for H. dentipalpis).
Hybocoptus gibbosus Holm, 1967: 37, f. 44-50 (mf, T from Minicia, S of Hybocoptus dentipalpis ).
Hybauchenidium gibbosum Holm, 1973: 86 (T from Hybocoptus).
Hybauchenidium gibbosum Paquin & Dupérré, 2003: 112, f. 1134-1137 (mf).
Hybauchenidium gibbosum Marusik, 2015: 688, f. 11E-F (f).

Hybauchenidium mongolensis Heimer, 1987a: 144, f. 12-17 (Dmf).
Oedothorax mongolensis Marusik et al., 1993b: 74 (T from Hybauchenidium).
Hybauchenidium mongolensis Lin, Lopardo & Uhl, 2022: 534 (T from Oedothorax).