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 through its funnel. The shell and tentacles are shown here as shadows.Diagram:
K.D. Schroeder
 | This picture of the day has been featured on Portal:Animals. |
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 through its funnel. The shell and tentacles are shown here as shadows.Diagram:
K.D. Schroeder
|
| This picture of the day has been featured on Portal:Animals. |