The arm crown of modern nautilids (genera Nautilus and Allonautilus) is very distinct in comparison to coleoids. Unlike the ten-armed Decabrachia or the eight-armed Octopodiformes, nautilus may possess any number of t… See more

To swim, the nautilus draws water into and out of the living chamber with its hyponome, which uses jet propulsion. This mode of propulsion is generally considered inefficient compared to propulsion with fins or … See more

Nautiluses are only found in the Indo-Pacific, from 30° N to 30° S latitude and 90° E to 175° E longitude. They inhabit the deep slopes of coral reefs.
Nautiluses usually inhabit depths of several hundred m… See more