The epigyne, with its horse-shoe-shaped depression and looped seminar ducts, can help identify the species.

Langona fusca is a jumping spider that was first described by the Polish arachnologist Wanda Wesołowska in 2011.

[3][4] The genus was listed in the subtribe Aelurillina in the tribe Aelurillini by Wayne Maddison in 2015.

[7] The spider is large and hairy, typically measuring over 10 mm (0.39 in) in total length.

The seminal ducts are looped and lead to receptacles that are smaller than related species.

and there is a single apophysis, or appendage, on the pedipalp tibia, which enables it to be distinguished from other Aelurillinae.

However, the clearest way to distinrguish the species from others in the genus is the large size and dark colour.