Due to the striking similarities between Nautilus and its subspecies from their identical DNA sequence sections and synapomorphies, there is significant evidence to suggest that Nautilus pompilius exhibits phenotypic plasticity. Namely, Nautilus subspecies identification through taxonomic features is difficult between populations as many features that were thought to be unique may overlap across different Nautilus populations.
Because of the close genetic similarities between Nautilus and its subspecies, particularly in their DNA sequences and shared anatomical features, there's strong evidence that *Nautilus pompilius* displays phenotypic plasticity. This means it can change its appearance based on its environment, making it difficult to distinguish between different subspecies using traditional taxonomic methods.