Fig. 8
From: Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids
Bivariate plots conch parameters and septal spacing (of the last half volution) of all analysed specimens. A Conch width index (ww/dm) and septal spaces. B Whorl width index (ww/wh) and septal spaces. C Whorl expansion rate (WER) and septal spaces