Abstract
Abstract. Two morphometric
methods are applied and compared for the analysis of suture lines in Early
Carboniferous ammonoids of the superfamilies Pericycloidea, Girtyoceratoidea
and Goniatitoidea. We analysed (1) classic metric data (proportions of the
width and depths or heights of lobes and saddles) using multivariate
statistic methods and (2) outline data of the external lobe and the
ventrolateral saddle of the same ammonoid taxa using the elliptic Fourier
analysis. Both methods lead to similar results and simultaneously demonstrate
ontogenetic and phylogenetic trends of these ammonoids. Our results are
consistent with three previously suggested evolutionary patterns: (1) a
general decrease of the amplitude of lobes and saddles, (2) a proportional
widening of the external lobe and (3) a heightening of the median saddle.
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