| After the pericardium and pleurae have been separated off the remainder of the coelom becomes the peritoneum. |
| The thorax shows the external surface of the anterior half of the axial rings and of the inner portions of the pleurae. |
| In some cases, the carapace margin, the opisthosomal pleurae, and distal regions of the tail spine are absent. |
| There is probably very little difference in the lower level of the pleurae on the two sides. |
| Normally, the pleurae are silky smooth, allowing your lungs to slide easily along your chest wall when you breathe in and out. |
| At the posterior of the body, the pleurae were fused into a flattened tail-like segment, or pygidium. |
