Fig. 15
From: Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids
Ontogenetic trajectories of septal distances in nine specimens of Pseudoprobeloceras nebechense (Bensaïd, 1974) from Hassi Nebech, specimens MB.C.30284.1-9. Respective phragmocone diameters (in mm) in the bottom boxes