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Nautilus are collected or fished for sale as live animals or to carve the shells for souvenirs and collectibles, not for just the shape of their shells, but also the nacreous inner shell layer, which is used as a pearl substitute. [49] [50] [51] In Samoa, nautilus shells decorate the forehead band of a traditional headdress called tuiga. [52]
The chambered nautilus (Nautilus pompilius), also called the pearly nautilus, is the best-known species of nautilus. The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is not a golden spiral. The shell exhibits countershading, being light on the bottom and dark on top. This ...
The Bailey-Matthews National Shell Museum opened to the public in 1995, and operates as an information and reference center for national and international scientists, students, and shell enthusiasts, particularly those who are interested in the marine, terrestrial, and freshwater mollusks of the Gulf of Mexico and Florida.
Marine mollusk shells that are familiar to beachcombers and thus most likely to be called "seashells" are the shells of marine species of bivalves (or clams), gastropods (or snails), scaphopods (or tusk shells), polyplacophorans (or chitons), and cephalopods (such as nautilus and spirula). These shells are very often the most commonly ...
The Registry of World Record Size Shells is a conchological work listing the largest (and in some cases smallest) verified shell specimens of various marine molluscan taxa.A successor to the earlier World Size Records of Robert J. L. Wagner and R. Tucker Abbott, it has been published on a semi-regular basis since 1997, changing ownership and publisher a number of times.
Cutaway of a nautilus shell showing the chambers. The phragmocone is the chambered portion of the shell of a cephalopod.It is divided by septa into camerae.. In most nautiloids and ammonoids, the phragmocone is a long, straight, curved, or coiled structure, in which the camerae are linked by a siphuncle which determines buoyancy by means of gas exchange.