Big navel parrot snail shell

Nautilus is a general term for marine mollusks in the family Nautilidae, order Cephalopoda. There are 2 genera and 6 species, with a curly pearl like shell. The maximum size of the shell can be 26 centimeters, but adult parrot snails generally do not exceed 20 centimeters. Usually only 16 centimeters. The shell is composed of many chambers, and the outer jacket is located inside the shell. Each chamber is separated by a diaphragm; 2 pairs of gills; Has 63-94 wrists, but no suction cups. The shell is thin and light, coiled in a spiral shape, with a white or milky white surface. The growth lines radiate from the navel of the shell, smooth and dense, mostly reddish brown in color. The entire spiral shaped shell is smooth like a disc, resembling a parrot's beak, hence the name "Nautilus".