| The thoracic ribs are long and relatively uncurved distally, suggesting a deep body. |
| Spine ornament varies only slightly, mostly in angle of spinules to the shaft, from nearly perpendicular to distinctly distally angled. |
| In other cases, the union of the two halves occurs in the manubrial region but fails distally. |
| The labial surfaces of the plates are smooth, slightly convex both mesially and distally with a shallow concavity between. |
| Accordingly, where the function of the sail is thermoregulatory, the spines in are not only thin, but can and do become thinner distally. |
| Farther distally around the middle part of the shaft, is the deltoid tuberosity along the lateral border. |
