Gymnosoma nudifrons can reach a length of 5–7.5 millimetres (0.20–0.30 in).
These parasitic flies have a black thorax and a spherical yellowish-red abdomen with reduced bristles and black markings, often  large and triangle-shaped, sometimes touching.
On the inner side of the eyes there are black stripes.
The males of this species have yellowish dusting on the first part of the thorax.
This species is very similar to Gymnosoma rotundatum.
Gymnosoma nudifrons can reach a length of 5–7.5 millimetres (0.20–0.30 in). These parasitic flies have a black thorax and a spherical yellowish-red abdomen with reduced bristles and black markings, often  large and triangle-shaped, sometimes touching. On the inner side of the eyes there are black stripes. The males of this species have yellowish dusting on the first part of the thorax. This species is very similar to Gymnosoma rotundatum.
Gymnosoma nudifrons