Nautilidae - Cenoceras Nautilus (No.55)

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Nautilidae - Cenoceras Nautilus (No.55)Cenoceras Nautilus
from Madagascar
150 Million Years Old, Late Jurassic

Measurements Approx.
Height - 10 cm
Width - 9 cm
Length - 13.1 cm

   


All Jurassic nautilids evolved from the genus Cenoceras, which appeared at the end of the Triassic and was the only genus to survive the change from the Triassic to the Jurassic.

   


As extant Nautildae do, Cenoceras swam in pelagic zones of seas (Any water in a sea or lake that is neither close to the bottom nor near the shore can be said to be in the pelagic)

Having survived relatively unchanged for millions of years, nautiluses represent the only living members of the subclass Nautiloidea, and are often considered "living fossils”.

As like with living Nautildae the Cenoceras had a coiled shell which Internally, was divides into chambers, the chambered sections are called the phragmocone.

Nautilus tentacles differ from those of other cephalopods. Lacking pads, the tentacles would stick to prey by virtue of their ridged surface. Nautiloids have a powerful grip.

To swim, the nautilus draws water into and out of the living chamber with its hyponome (the organ used by cephalopods to expel water, a function that produces a locomotive force)

Unlike many other cephalopods, they do not have good vision; their eye structure is highly developed but lacks a solid lens.

Nautilus comes from the Greek, meaning ’sailor' 

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