Troglohyphantes nigraerosae is a species of cave spider of the family Linyphiidae.

Troglohyphantes nigraerosae is a small sized cave spider with a body length of 3 mm (Prosoma length: 1.50 mm, prosoma width: 1.15 mm).

[1] From a genetic standpoint, T. nigrerosae represent the sister group of T.

Southern Graian Alps (NW Italy).

The species occurs preferentially in caves.