Fig 11. Profile of vertebral centrum length in the FSAC Bouj-200 partial skeleton of Antaecetus aithai compared to the profile for Basilosaurus isis (CGM 42195).

Thoracic vertebrae are shown in red, cervicals and lumbars in orange. Open symbols are interpolated. Dashed lines approximate the inflection points that separate anterior thoracics with fixed vertebrosternal ribs from middle thoracics with more mobile vertebrochondral ribs, and separate middle thoracics from posterior thoracics with floating ribs. Centrum lengths of A. aithai are approximate because these cannot be measured precisely. A. aithai is shown as having 13 thoracic vertebrae, but the number may have been greater.