In synonymy:
Poikilothele Mello-Leitão, 1923 (nomen nudum) = Monodontium Kulczyński, 1908 (Bonnet, 1958: 3744)

type Monodontium mutabile Kulczyński, 1908; gender neuter

N.B.: considered a senior synonym of Poikilothele Mello-Leitão, 1923c: 373 (nomen nudum) [urn:lsid:nmbe.ch:spidergen:05997] by Bonnet, 1958: 3744.

In synonymy:
Monodontium mutabile minus Kulczyński, 1908 = Monodontium mutabile Kulczyński, 1908 (Raven, 2008a: 32).
Monodontium mutabile oculatior Kulczyński, 1908 = Monodontium mutabile Kulczyński, 1908 (Raven, 2008a: 32).
Monodontium mutabile oculatissimum Kulczyński, 1908 = Monodontium mutabile Kulczyński, 1908 (Raven, 2008a: 32).

Monodontium bukittimah Raven, 2008a: 37, f. 5A-H, 6A-F (Dmf).

Monodontium malkini Raven, 2008a: 35, f. 4A-G (Df).

Monodontium mutabile Kulczyński, 1908a: 446 (Df).
Monodontium mutabile minor Kulczyński, 1908a: 450 (Df) [urn:lsid:nmbe.ch:spidersp:001461].
Monodontium mutabile oculatissima Kulczyński, 1908a: 450 (Df) [urn:lsid:nmbe.ch:spidersp:001462].
Monodontium mutabile oculatior Kulczyński, 1908a: 450 (Df) [urn:lsid:nmbe.ch:spidersp:001463].
Poikilothele mutabile Mello-Leitão, 1923a: 373 (in generic nomen nudum).
Monodontium mutabile Raven, 2008a: 32, f. 2A-E (f, S of Monodontium mutabile minor, M. mutabile oculatior and M. mutabile oculatissimum).

Monodontium sarawak Raven, 2008a: 41, f. 7A-D, 8A-E (Dmf).

Monodontium mutabile tetrathela Kulczyński, 1908a: 450 (Df).
Poikilothele tetrathele Mello-Leitão, 1923a: 373 (lapsus, in generic nomen nudum).
Monodontium tetrathela Raven, 2008a: 34, f. 2F, 3A-D (elevated f to species).