Nautilus shell. Computer graphic showing a cross- section of the shell of a Nautilus. The shell is empty of contents,with the inner chambers and spiral whorls visible. At each shell partition is a knob-like structure forming the siphuncle tube; this thin internal tube (not clearly seen) fills the shell chambers with a gas and enables the Nautilus to float or sink in the sea. The Nautilus is a cephalopod mollusc resembling a squid in having a foot of many tentacles. There are only 6 living species of Nautilus,descended from a large and ancient group which thrived in the early Palaeozoic era | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Pasieka, Alfred |
Taille de l’image : | 3485 px × 4479 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |