What is the biggest shell I can buy?
Royal Dutch Shell (NYSE: RDSA) is a multinational oil major based out of The Hague, Netherlands. It employs over 82,000 people and competes with a range of other oil majors including Exxon Mobil ...
What has the worlds largest shell?
The Board of directors as of 16 May 2020 was as follows:
- Charles O. ...
- Gerard Kleisterlee, chairman of Vodafone, former president and CEO of Philips
- Ben van Beurden, CEO of Royal Dutch Shell
- Jessica Uhl, CFO of Royal Dutch Shell
- Neil Carson, former CEO of Johnson Matthey
- Ann Godbehere, former CFO of Swiss Re and Northern Rock
- Euleen Goh, former CFO of Standard Chartered Singapore
- Catherine J. ...
What is the largest type of shell?
Terminology
- Bore –the interior diameter of a tube or cylinder, in this case, the inside of the shotgun barrel.
- Shot –the pellets inside some shotgun pellets. ...
- Wadding or Wad –this prevents the shot and powder from mixing, and provides a seal to keep gas from blowing through the shot instead of pushing it forward.
What is the largest sea shell found in the Americas?
- The sacred chank, Turbinella pyrum, known in India as the shankha. In Tibet it is known as "dung-dkar".
- The Triton shell also known as "Triton's trumpet" Charonia tritonis which is used as a trumpet in Melanesian and Polynesian culture and also in Korea and Japan. ...
- The Queen Conch Lobatus gigas, has been used as a trumpet in the Caribbean.
What is the largest shell ever found?
The biggest are giant clams, Tridacna gigas. Their twinned shells can grow to well over a metre across and tip the scales at 200kg, the same as two newborn elephants.
What is the rarest seashell in the world?
Conus Gloriamaris Seashell The Conus Gloriamaris or 'Glory of the Sea Cone' as it is more commonly known, is one of the most expensive and rarest seashells in the world.
What shells are worth money?
Conus Gloriamaris The "conus gloriamaris” — a ten-centimeter-long cone with delicate gold and black markings — has traditionally been one of the most valuable sea shells, with only a few dozen known. Stories about collectors who possessed them are legend.
How much is a triton shell worth?
The most rarity and length of the cone and weight determines the price. Left hand-sided or anti-clockwise are most rare 1 in 10000. Triton shells become more expensive day to day. Triton trumpet 18"-19" length would cost around 40 million $ (US D).
Where is the world record size shell?
Exhibit of official world record size shells (right) at the Bailey-Matthews National Shell Museum, Sanibel, Florida. While the importance of maximum shell size and its role in the overall scheme of Conchology and Malacology is debatable, it remains one point of continual interest among collectors and researchers.
What are the most popular shells?
Certain families of attractive shells (such as cones, cowries, marginellas, and murex ) are particularly favoured by collectors. World record size shells (commonly indicated by the acronym 'WRS') of species in the most popular families are much sought after by some shell collectors, and can thus command high prices. Collections of such shells are exhibited at a number of specialist museums, including the Bailey-Matthews National Shell Museum. Maximum and minimum sizes are also of interest to malacologists, and may be useful in delimiting closely related species. As an extensive compilation of maximum shell sizes, the registry has found use as a data source for scientific studies.
How big is a pinna nobilis?
The three largest species in the registry are the bivalves Kuphus polythalamia, Tridacna gigas and Pinna nobilis, with maximum recorded shell sizes of 1,532.0 mm (5 ft 0.31 in), 1,368.7 mm (4 ft 5.89 in) and 970.0 mm (3 ft 2.19 in), respectively. The fourth largest species, and the largest of all gastropods, is Syrinx aruanus with ...
How big is a shell in mm?
Shell sizes are given in millimetres and recorded to the nearest 0.1 millimetres (0.0039 in), as is standard in conchology. To account for human error and environmental effects, new records are only accepted if they exceed the standing record by at least 0.3 mm (0.012 in).
When did the world size record come out?
World Size Records originally appeared in the first and second editions of the Standard Catalog of Shells in 1964 and 1967, and then as four supplements to the third edition (one of which was titled a revision) between 1978 and 1990. A list of new entries—submitted for inclusion in World Size Records as of November 1987—appeared across the 1988 and 1989 issues of Hawaiian Shell News and also in American Conchologist.
When were shells measured?
In the early years of the registry, shells were sometimes officially measured for world record size status at Conchologists of America conventions, as in 1999 when the measurements were carried out by senior author Kim Hutsell.
Who published the world record for shells?
The direct predecessor to the Registry of World Record Size Shells was World Size Records, compiled by renowned malacologists Robert J. L. Wagner (1905–1992) and R. Tucker Abbott (1919–1995) . These record sizes originally appeared in 1964, in the first edition of Van Nostrand's Standard Catalog of Shells, not as a separate list but interspersed among other species-specific information that made up the bulk of the work. An updated list—now with a section unto itself and running to eight pages—was published as part of the book's second edition, in 1967. Though not stated as such, records from 1950–1959 were taken from lists in the "Minutes of the Conchological Club of Southern California" and included outdated information, including long-deceased owners. The next update appeared in the work's third edition, which was renamed Wagner and Abbott's Standard Catalog of Shells. Unlike previous editions, this third and final installment of the catalog was a ring binder with loose-leaf content, intended as a continually updated resource. To match the newly retitled work, the list's name was modified to Wagner and Abbott's World Size Records. In this final incarnation, the list appeared as a series of four supplements: the first two were loose-leaf publications that appeared in 1978 and 1982, and these were followed by hole-punched paperback titles in 1985 and 1990. The records were to be maintained "by a special committee of editors through which accurate measurements and correct identifications are verified by knowledgeable conchologists". The third supplement encompassed shells from 21 museums and more than 300 private collections, with the authors of the opinion that "many new records lurk in museums where scientists do not have the time or inclination to measure largest specimens". At the time, the American Museum of Natural History officially held the most record specimens, followed by the British Museum (Natural History) (London's Natural History Museum) and the Natural History Museum of Los Angeles County. The much-expanded fourth supplement incorporated many records from the final (1987) edition of the Lost Operculum Club List of Champions. It also lowered the minimum shell size to one inch (2.54 cm) from the previous 4.00 cm (except for Cypraea, which did not have a lower limit). Carole Hertz, long-time editor of The Festivus, noted that "a few" records were outdated upon publication as they listed deceased shell owners. Wagner died in 1992 and, though it was announced the following year that World Size Records would continue to be published, no further supplements were completed before Abbott's death in 1995.
How long is the largest turtle shell?
An 8-million-year-old turtle shell unearthed in Venezuela measures nearly 8 feet (2.4 meters) long, making it the largest complete turtle shell known to science, a new study reported.
How did the squid get its size?
The species likely achieved its colossal size thanks to the warm wetlands and lakes in its habitat, Sánchez noted.
How much does a S. geographicus weigh?
S. geographicus weighed an estimated 2,500 lbs. (1,145 kilograms), almost 100 times the size of its closest living relative, the Amazon river turtle ( Peltocephalus dumerilianus ), and twice the size of the largest living turtle, the marine leatherback ( Dermochelys coriacea ), the researchers wrote in the study.
Where are the turtle fossils found?
(Image credit: Edwin Cadena) Rodolfo Sánchez (left) and Edwin Cadena (right) work together to excavate the enormous turtle fossils found in northern Venezuela.
What is the largest bivalve mollusk?
Giant clam. The giant clams are the members of the clam genus Tridacna that are the largest living bivalve mollusks. There are actually several species of "giant clams" in the genus Tridacna, which are often misidentified for Tridacna gigas, the most commonly intended species referred to as “the giant clam”.
How big is a giant clam?
However, it was not examined scientifically before 1984. The shell's length was 115 centimetres (3 ft 9 in) and the weight of the shells and soft parts was 333 kilograms (734 lb). Scientists estimated the live weight to be around 340 kilograms (750 lb).
How many vertical folds does Tridacna gigas have?
Tridacna gigas has four or five vertical folds in its shell; this is the main characteristic that separates it from the similar shell of T. derasa, which has six or seven vertical folds. As with massive deposition of coral matrices composed of calcium carbonate, the bivalves containing zooxanthellae have a tendency to grow massive calcium carbonate shells. The mantle's edges are packed with symbiotic zooxanthellae that presumably utilize carbon dioxide, phosphates, and nitrates supplied by the clam.
What is the name of the giant clam?
There are actually several species of "giant clams" in the genus Tridacna, which are often misidentified for Tridacna gigas, the most commonly intended species referred to as “the giant clam”. Tridacna gigas is one of the most endangered clam species. Antonio Pigafetta documented these in his journal as early as 1521.
What do giant clams need to grow?
Feeding. Algae provide giant clams with a supplementary source of nutrition. These plants consist of unicellular algae, whose metabolic products add to the clam's filter food. As a result, they are able to grow as large as one meter in length even in nutrient-poor coral-reef waters.
Why are giant clams endangered?
The main reason that giant clams are becoming endangered is likely to be intensive exploitation by bivalve fishing vessels. Mainly large adults are killed, since they are the most profitable. The giant clam is considered a delicacy in Japan (known as himejako ), France, South East Asia and many Pacific Islands.
How much carbon does a clam need to grow?
In small clams—10 milligrams (0.010 g) dry tissue weight—filter feeding provides about 65% of total carbon needed for respiration and growth; large clams (10 g) acquire only 34% of carbon from this source.
