7" PEARL NAUTILUS DOUBLE CUT SEA SHELL BEACH NAUTICAL DECOR CRAFT

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CENTER CUT NAUTILUS SEA SHELL 7" LONG Nautiluses are the sole living cephalopods whose bony body structure is externalized as a shell . The animal can withdraw completely into its shell and close the opening with a leathery hood formed from two specially folded tentacles . The shell is coiled, aragonitic ,[ 4] nacreous and pressure resistant, imploding at a depth of about 800 metres (2,600 ft). The nautilus shell is composed of 2 layers: a matte white outer layer, and a striking white iridescent inner layer. The innermost portion of the shell is a pearlescent blue-gray. The osmena pearl , contrarily to its name, is not a pearl , but a jewellery product derived from this part of the shell. To swim, the nautilus draws water into and out of the living chamber with its hyponome , which uses jet propulsion . While water is inside the chamber, the siphuncle extracts salt from it and diffuses it into the blood. The animal adjusts its buoyancy by osmotically pumping gas and fluid into or out of the camerae along the siphuncles. This limits them; they cannot operate under the extreme hydrostatic pressures found at depths greater than approximately 800 metres (2,600 ft).In the wild, nautiluses usually inhabit depths of about 300 metres (980 ft), rising to around 100 metres (330 ft) at night to feed, mate and to lay eggs . THIS IS A REAL read more

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