Left: A high-resolution X-ray scan of the 305-million-year-old harvestman fossil (Hastocularis argus). Scale bar equals 4 millimeters. Top right: Side view of the new fossil, showing the profile of the body. The projections bearing the two sets of eyes are indicated with brackets. Scale bar equals 2 millimeters. Bottom right: Head-on view of the left side of the fossil. Red shading designates the location of the median eye and green shading designates the lateral eye. Scale bar equals 1 millimeter.