Odiellus spinosus is a species of harvestmen in the family Phalangiidae.

Odiellus spinosus can reach a body length of 6.5–8 millimetres (0.26–0.31 in) in males, of 7–11 millimetres (0.28–0.43 in) in females.

[2] This harvestmen shows three large, almost flat spines (hence the species name) in front of the eyes and a black-edged saddle on the back.

Moreover the abdomen is distinctly flattened, with some rows of brown spots across each tergite.

[2][3] Adults can be found from June and until December.