Home Local Classifieds. University of Leeds. The family Nautilidae has its origin in the Trigonocerataceae Centroceratinaspecifically in the Syringonautilidae of the Late Triassic  and continues to this day with Nautilusthe type genus, and its close relative, Allonautilus. The nautilus shell is composed of two layers: a matte white outer layer, and a striking white iridescent inner layer.
Matsumoto Species dubium [ fide Saunders ]. Fifth edition. Certain species reached over 2. The one exception to this is the vena cava, a single large vein running along the underside of the crop into which nearly all other vessels containing deoxygenated blood empty.
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An Investigation into the Trade of Nautilus. The "ear" of the nautilus consists of structures called otocysts located immediately behind the pedal ganglia near the nerve ring. This is done in response to sudden changes in buoyancy that can occur with predatory attacks of fish, which can break off parts of the shell.
Nautiluses also tend to have rather short memory spans, and the nerve ring is not protected by any form of brain case. Brain, Behavior and Evolution.