Two Palau Nautiluses (Nautilus belauensi) floatinjg in the ocean, face to face. They both have white spiral shells with brown stripes, a triangle shaped hood above its head that has a brown area with white spots, and many small appendages called cirri. Their eyes are simple pinhole type eye that a small circular opening with a vertical slit below it.
A very tiny and cute nautilus hatchling. It looks like an adult nautilus with softer colours and shrunk down to 3-4 centimetres in length. Its spiral shell is mostly a soft orange with white patches and ridges. Its hood is bumpy, as its orange and white. Its eye is slightly translucent and mostly black with orange around the edge.
Chambered nautilus (Nautilus pompilius) (left) swimming next to a Fuzzy nautilus (Allonautilus scrobiculatus) (right). The chambered nautilus has a white spiral shell with orange stripes at the top, a triangle shaped hood above its head that has a brown area with white spots, and many small appendages called cirri. Its eye is simple pinhole type eye that a small circular opening with a vertical slit below it. The fuzzy nautilus looks very similar to the chambered nautilus, except the hood is smaller and curved downward, and its shell is mostly covered in a yellow fuzz called a periostracum.
A pair of Chambered nautiluses (Nautilus pompilius) feeding on two-spot red snapper (Lutjanus bohar) bait during daytime at 703 m (2,306 ft) depth. One is gripping the fish with its cirri while the other floats nearby.
Nautiluses (family Nautilidae) are the only living cephalopods with an external shell. Nautiloids diverge from the rest of the cephalopods around 420 million years ago, which is why they are so different compared to other living cephalopods.
#CephalopodWeek