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Shapes of the ammonoid whorl: Tables

TABLE 1. Results of the geometric morphometric analyses showing the percentage of variance summarised by each principal component.

PC Eigenvalues % Variance Cumulative %
1 0.060 54.566 54.566
2 0.028 24.875 79.441
3 0.008 7.475 86.917
4 0.006 5.187 92.104
5 0.004 3.198 95.302
6 0.002 1.688 96.990
7 0.001 0.988 97.978
8 0.001 0.843 98.820
9 0.000 0.400 99.221
10 0.000 0.266 99.487
11 0.000 0.195 99.682
12 0.000 0.159 99.841
13 0.000 0.097 99.938
14 0.000 0.057 99.995
15 0.000 0.005 100.000
16 0.000 0.000 100.000

 

 

 

TABLE 2. Statistic results for the simple additive linear models for PC1. Model 1 considers the centroid size (CS) and the subtaxa as predictors. Model 2 considers the diameter and the subtaxa as predictors. Non-spiral ammonoid specimens were omitted. Bold entries refer to significant factors. CI refers to the 95% confidence interval.

Model 1   PC1   Model 2   PC1
Predictors   Estimates CI p   Predictors   Estimates CI p
(Intercept)   0.10 -0.07 - 0.28 0.251   (Intercept)   -0.15 -0.32 - 0.03 0.105
CS [log]   -0.03 -0.07 - -0.00 0.025   D [log]   0.03 -0.00 - 0.06 0.070
ST [Goniatitina]   -0.14 -0.29 - 0.00 0.054   ST [Goniatitina]   -0.12 -0.27 - 0.03 0.108
ST [Tornoceratina]   -0.08 -0.24 - 0.08 0.307   ST [Tornoceratina]   -0.04 -0.20 - 0.12 0.614
ST [Clymeniida]   -0.11 -0.32 - 0.10 0.293   ST [Clymeniida]   -0.09 -0.30 - 0.11 0.364
ST [Prolecanitida]   0.25 0.04 - 0.47 0.022   ST [Prolecanitida]   0.29 0.07 - 0.50 0.008
ST [Ceratitida]   0.05 -0.11 - 0.20 0.554   ST [Ceratitida]   0.04 -0.11 - 0.19 0.625
ST [Lytoceratina]   0.13 -0.10 - 0.35 0.272   ST [Lytoceratina]   0.11 -0.11 - 0.34 0.320
ST [Phylloceratina]   0.02 -0.17 - 0.22 0.808   ST [Phylloceratina]   0.00 -0.19 - 0.20 0.972
ST [Ammonitina]   0.08 -0.05 - 0.22 0.238   ST [Ammonitina]   0.06 -0.07 - 0.20 0.374
ST [Ancyloceratina]   0.16 0.00 - 0.32 0.047   ST [Ancyloceratina]   0.15 -0.03 - 0.32 0.107
Observations   300       Observations   288    
R2 / R2 adjusted   0.165 / 0.136     R2 / R2 adjusted   0.153 / 0.123  

 

 

 

 

TABLE 3. Statistic results for the simple additive linear models for the measured area in mm2. Model 3 considers the centroid size (CS) and the subtaxa as predictors. Model 4 employs the diameter as the predictor. Non-spiral ammonoid specimens were omitted. Model 5 employs the whorl height as the predictor. CI refers to the 95% confidence interval.

Model 3   Area (mm2)   Model 4   Area (mm2)
Predictors   Estimates CI p   Predictors   Estimates CI p
(Intercept)   0.25 0.16 - 0.37 <0.001   (Intercept)   0.21 0.17 - 0.26 <0.001
ST [Goniatitina]   1.07 0.77 - 1.50 0.677   Log (D)   6.56 6.21 - 6.93 <0.001
ST [Tornoceratina]   0.88 0.61 - 1.27 0.492   Observations   288    
ST [Clymeniida]   1.03 0.64 - 1.66 0.891   R2 marginal   0.731    
ST [Prolecanitida]   0.93 0.57 - 1.52 0.762   Model 5     Area (mm2 )
ST [Ceratitida]   1.11 0.79 - 1.57 0.539   Predictors   Estimates CI p
ST [Lytoceratina]   1.73 1.03 - 2.90 0.038   (Intercept)   0.97 0.83 - 1.13 0.698
ST [Phylloceratina]   1.12 0.71 - 1.77 0.62   Log (H)   6.49 6.18 - 6.82 <0.001
ST [Ammonitina]   1.47 1.07 - 2.00 0.016   Observations   300    
ST [Ancyloceratina]   1.73 1.20 - 2.50 0.003   R2 marginal   0.74    
Log (CS)   5.89 5.47 - 6.35 <0.001         -  
Observations   300                
R2 marginal   0.731