Nautilus shell morphomics reveals microstructural heterogeneity alongside structural continuity across component boundaries

The complex structure of the nautilus (Nautilus sp.) shell enables it to withstand pressure, regulate buoyancy, and protect against external threats. A recent study analyzed the microstructures of this shell across various components and growth stages in two adult museum specimens. The researchers identified five distinct microstructural types—spherulitic, prismatic, nacreous, semi-prismatic, and irregularly oriented prismatic—arranged in layered configurations within each component and coordinated throughout the entire shell.

These observations reveal transitions between different microstructures both within and between shell components, as well as local variations within individual components like the dorsal and ventral walls. This suggests that these patterns likely contribute to the shell's strength and overall mechanical performance. Additionally, differences in the morphology of the caecum indicate that this structure may exhibit developmental plasticity and be subject to less stringent structural constraints.

The study concludes that the Nautilus shell is an integrated biomineral system with diverse microstructures strategically arranged across components to fulfill functional needs and provide the necessary mechanical strength for the organism's survival.