No time for anything new, so here’s a post built from parts of other, older posts. The fourth sacral centrum of Haplocanthosaurus CM 879, in left and right lateral view. This is part of the original color version of Wedel (2009: figure 8), from this page. (Yes, I know I need to get around to posting the full-color versions of those figures. It’s on my To Do list.) Note the big invasive fossa on the right side of the centrum.