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Table 4 Slope, intercept and R2-value of the average septal slope factor of 23 species corresponding to their geological age (average value of beginning and end of the corresponding stage after the ICS from 2020, Cohen et al., 2013). For the raw data see Additional file 1

From: Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?

Species Septal slope factor Intercept Age (Ma, midpoint) R2 of average septal slope factor
Desmoceras sp. 0.0078 − 0.0345 105.5 0.9719
Cleoniceras sp. 0.0028 − 0.0237 105.5 0.8817
Gaudryceras sp. 0.0124 − 0.0445 105.5 0.9814
Argonauticeras besairei 0.0107 − 0.0706 105.5 0.9759
Eogaudryceras umbilicostriatus 0.004 0.0128 106.75 0.682
Divisosphinctes besairei 0.0037 − 0.0191 154.3 0.7048
Macroceph. compressus 0.0041 − 0.027 168.8 0.9832
Ludwigia bradfordensis 0.0024 0.005 172.2 0.8381
Staufenia opalinoides 0.0004 0.0689 172.2 0.0837
Leioceras sp. 0.001 0.0451 176.5 0.4042
Dactylioceras commune 0.0027 − 0.0397 178.4 0.47
Lytoceras fimbriatum 0.0067 − 0.0528 187.7 0.9204
Asteroceras sp. 0.0019 0.0019 195.05 0.8359
Arietites sp. 0.0012 0.0973 195.05 0.7984
Fuciniceras cf. isseli 0.0064 − 0.0103 195.05 0.5752
Schlotheimia sp. 0.0036 − 0.0065 196.1 0.8074
Psiloceras planorbis 0.0047 − 0.0064 200.3 0.9054
Psiloceras naumanni 0.0034 0.0499 200.3 0.8506
Arcestes sp. 0.0048 − 0.0639 222.8 0.5523
Halorites sp. 0.0098 − 0.0519 222.8 0.9499
Cladiscites sp. 0.0147 − 0.1953 222.8 0.935
Discophyllites ebneri 0.0077 − 0.0311 222.8 0.9389
Megaphyllites sp. 0.0054 0.0647 222.8 0.8436
Monophyllites sp. 0.0067 − 0.0206 222.8 0.9488
Rhacophyll. neojurensis 0.0075 − 0.0433 222.8 0.9889