Nautilus Shells And Ammonite
by George Bernard/science Photo Library
Title
Nautilus Shells And Ammonite
Artist
George Bernard/science Photo Library
Medium
Photograph - Photograph
Description
Nautilus shells and ammonite. 1752 engraving of the shell of a nautilus (Nautilus sp. Fig. 1 & 2) and that of an ammonite (Fig. 3), an extinct relative. When cut open, the shell of a nautilus is seen to consist of a spiral of air-filled chambers. The animal lives in the outermost chamber, building successively larger additions through its life. A tube called a siphuncle links the chambers and keeps them filled with gas, which gives the animal buoyancy in its marine habitat. There are only six living species of Nautilus, descended from a large group that originated in the early Palaeozoic Era.
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September 28th, 2018
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