Fig. 6 in Dimorphism in Late Cretaceous ammonites- evidence from early Turonian ammonite faunas of the Briessnitz Formation in Saxony, Germany

Fig. 6. Statistical test of potential dimorphism in Mammites nodosoides (Schlüter, 1871) based on 119 specimens. The repository number of each specimen is given on top of the diagram. A. Classical clustering; the red color characterises particularly small individuals with D = 33–65 mm in between the large group of potential microconchs. B. Linear discriminant analysis (LDA); the color code follows the assignment of the classical clustering above. The dark blue lines are biplots of all variables, an overlaying of a score plot and a loadings plot in a single graph, which enables to visualise high-dimensional data by using a two-dimensional graph.