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English: Diagram of the anatomy of an adult female Nautilus pompilius depicting the digestive, reproductive, and some of the circulatory, nervous, and muscular systems. Français : Diagramme de l'anatomie d'une femme adulte Nautilus pompilius représentant les systèmes digestif, reproducteur et certains des systèmes sanguin, nerveux et ...
There are two sets of ocular tentacles: one set in front of the eye (pre-ocular) and one set behind the eye (post-ocular). The digital and labial tentacles are arrayed circularly around the mouth, with the digital tentacles forming the outermost ring and the labial tentacles in between the digital tentacles and the mouth.
Nautilus are unable to easily move across areas deeper than 800 metres, and most of their activity occurs at a depth of 100–300 metres deep. [4] Nautilus can occasionally be found closer to the surface than 100 metres, however, the minimum depth they can reach is determined by factors such as water temperature and season. [4]
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Anatomical diagram of an adult female chambered nautilus, the best known species of nautilus, a "living fossil" related to the octopuses. The animal has a primitive brain that forms a ring around its oesophagus , has four gills (all other cephalopods have only two), and can only move shell-first (seemingly "backwards") by pumping water out ...
Original – Diagram of the anatomy of a female Nautilus pompilius Reason Freely licensed, meets all other criteria. This image has been almost two years in the making— please offer any comments for suggestions or improvements, I am still taking all of them (really! I need suggestions to improve!). Thanks!
In the genus Nautilus, the spadix is a composite erectile organ in the male located in the oral region which is composed of four highly modified tentacles and which is paired with a somewhat smaller antispadix that is also composed of four tentacles. The spadix is normally a concealed organ but quickly becomes distended upon the animal's death.
The chambered nautilus (Nautilus pompilius), also called the pearly nautilus, is the best-known species of nautilus. The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is not a golden spiral. The shell exhibits countershading, being light on the bottom and dark on top. This ...