The different layers of the Apteryx eggshell
Apteryx eggshells showed a clear demarcation between the four constituent layers (Figure 3). With exception of the mammillary layer (ANOVA, F=1.85, p=0.150; n=59), the constituent layers of the eggshell showed variation between species. The proportion of cuticle from the total eggshell thickness (ANOVA, F=8.85, p<0.001; n=59) and the proportional thickness of the crystalline and palisade layers (F=6.76, p = 0.001; n=59) varied significantly between the fourApteryx species (Figure 3).