Fig. 4

Morphometric parameters investigated: δX spiral height, δY axial length, Φ ₁ upper keel angle, Φ ₂ lower keel angle, Φ ₃ angle at the apex, A spiral convexity, B umbilical convexity, R _up radius of the osculating circle in the upper keel region; R _lo radius of the osculating circle in the lower keel region. The specimen to the left illustrates assignment of parameters in keel view of a sinistral test (=standard imaging position). The representations in the middle and to the right show a dextral specimen in keel view as imaged with AMOR (middle) and after dextral flip operation with re-assigned parameters (right). Note, that in the sinistrally coiled specimen the final chamber is facing to the bottom, while in the dextral specimen the final chamber in imaging position is facing to the top. After application of the dextral flip operation to the dextral specimen the final chamber is facing to the bottom, which then can be more easily compared to a sinistral specimen (see further explanations in the text)