An important key factor to understanding these creatures is ageing, many deepwater Apristurus profundorum have poorly calcified vertebrae that lack visible growth bands, and most do not have dorsal fin spines that can be used for ageing.
To comprehend these creatures effectively, it's crucial to consider their aging process. Many deepwater Apristurus profundorum exhibit poorly calcified vertebrae lacking growth rings, and most lack dorsal fin spines suitable for age determination.