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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.
This is the largest extant snail (shelled gastropod) species in the world, and arguably the largest (heaviest) gastropod in the world. Although the shell itself is quite well known to shell collectors because of its extraordinary size, little is known about the ecology and behavior of the species, [7] except for one study about its feeding habits.
The largest known T. gigas specimen measured 137 centimetres (4 ft 6 in), and it weighed 230 kg (510 lb) dead and was estimated to be 250 kg (550 lb) alive. It was discovered around 1817 on the north western coast of Sumatra, Indonesia, and its shells are now on display in a museum in Northern Ireland. [6]: 31 [15]
The shell of the clam ranges from 15 centimetres (6 in) to over 20 centimetres (8 in) in length, but the extremely long siphons make the clam itself much longer than this: the "shaft" or siphons alone can be 1 metre (3 ft 3 in) in length. The geoduck is the largest burrowing clam in the world. [3]
The largest shell-less gastropod is the giant black sea hare (Aplysia vaccaria) at 0.99 m (3.2 ft) in length and almost 14 kg (31 lb) in weight. The largest of the land snails is the giant African snail (Achatina achatina) at up to 1 kg (2.2 lb) and 35 cm (14 in) long. Cephalopods (Cephalopoda) (See Cephalopod size.)
The largest known specimen of Triplofusus giganteus had a shell 604.8 millimetres (23.81 in) long. [6] However, populations have declined in size in recent years due to overharvesting; the largest individuals observed in various recent surveys have had shells ranging from 341 to 400 millimetres (13.4 to 15.7 in). [7]
The pearl has a length close to 2 feet and the weight of the pearl is close to 34 kilograms. Its vertical folds that emulate the shell of the tridacna gigas indicate that it is a carved shell. [5] Unlike true pearls, the Pearl of Puerto does not show iridescence. Since the pearl is bigger than the Pearl of Lao Tzu, the value of the pearl is ...
Explosive shells: In the Industrial Age, artillery was again revolutionized by the introduction of explosive shells, beginning with the Paixhans guns. Breakthroughs in metallurgy and modes of production were followed up by new experimentation with super-sized caliber weapons, culminating in the steel colossi of the two World Wars.