The genusAllonautilus contains two species of nautiluses, which have a significantly different morphology from those placed in the sister taxonNautilus. Allonautilus is now thought to be a descendant of Nautilus and the latter paraphyletic.
The genusAllonautilus contains two species of nautiluses, which have a significantly different morphology from those placed in the sister taxonNautilus. Allonautilus is now thought to be a descendant of Nautilus and the latter paraphyletic.