Functional interpretation of inner shell layers in Triassic ceratid ammonites

Publisher Website
Google Scholar
Abstract
The wrinkle layer and the inner prismatic layer are described in three Triassic ceratid genera; Phyllocladiscites, Megaphyllities and Proarcestes. Both layers have their counterparts in the shell wall of the recent Nautilus: the wrinkle layer corresponds to the mantle-adhesive layer and the inner prismatic layer to the myostracal layer in Nautilus. A detailed structural and functional comparison between these layers is given. The wrinkle layer is also compared with the oblique prismatic layer in recent gastropods.