In synonymy:
Marxiellia Mello-Leitão, 1917 = Dossenus Simon, 1898 (Mello-Leitão, 1947c: 8)

type Dossenus marginatus Simon, 1898; gender masculine

N.B.: placed in the "Trechalea genus-group" by Sierwald, 1990: 51; considered a senior synonym of Marxiellia Mello-Leitão, 1917c: 122 [urn:lsid:nmbe.ch:spidergen:05902] (type M. fluminensis Mello-Leitão, 1917) by Mello-Leitão, 1947c: 8.

Transferred to other genera:
Dossenus fidelis Mello-Leitão, 1943 -- see Enna
Dossenus redundans Platnick, 1993 -- see Enna

Nomina dubia:
Dossenus fidelis Mello-Leitão, 1921c: 180 (j, Brazil) -- Silva, Lise & Carico, 2007: 141.
Dossenus fluminensis (Mello-Leitão, 1917c: 122, j, Brazil, originally in Marxiellia) -- Silva, Lise & Carico, 2007: 141.
Dossenus longipes Mello-Leitão, 1941f: 203, f. 1 (j, Argentina) -- Silva, Lise & Carico, 2007: 141.
Dossenus marginellus Badcock, 1932: 35, f. 26 (j, Brazil) -- Silva, Lise & Carico, 2007: 141.

Dossenus guapore Silva, Lise & Carico, 2007: 147, f. 19-20, 31-32 (Df).
Dossenus guapore Silva & Lise, 2010a: 313, f. 1-2 (Dm).

Dossenus marginatus Simon, 1898a: 314, f. 315.
Dossenus marginatus Simon, 1898f: 19 (Dmf).
Dossenus marginatus F. O. Pickard-Cambridge, 1903c: 155, pl. 14, f. 3-5 (f).
Dossenus marginatus Silva, Lise & Carico, 2007: 141, f. 2-18, 21-30 (mf).
Dossenus marginatus Carvalho & Gasnier, 2019: CB52, f. 255-256 (m).

Dossenus paraensis Silva & Lise, 2011b: 67, f. 1-2 (Df).