Description: Leedsichthys is an extinct genus of pachycormid fish that lived in the oceans of the Middle to Late Jurassic. It is the largest ray-finned fish, and amongst the largest fish known to have ever existed. The first remains of Leedsichthys were identified in the nineteenth century. Especially important were the finds by the British collector Alfred Nicholson Leeds, after whom the genus was named "Leeds' fish" in 1889. The type species is Leedsichthys problematicus. Leedsichthys fossils have been found in England, France, Germany and Chile. In 1999, based on the Chilean discoveries, a second species was named Leedsichthys notocetes, but this was later shown to be indistinguishable from L. problematicus. Leedsichthys fossils have been difficult to interpret because the skeletons were not completely made of bone. Large parts consisted of cartilage that did not fossilize. On several occasions the enigmatic large partial remains have been mistaken for stegosaurian dinosaur bones. As the vertebrae are among the parts that have not been preserved, it is hard to determine the total body length. Estimates have varied significantly. At the beginning of the twentieth century, a length of 9 m (30 ft) was seen as plausible, but by its end Leedsichthys was sometimes claimed to have been over 30 m (98 ft) long. Recent research has lowered this to about 16.5 m (54 ft) for the largest individuals. Skull bones have been found indicating that Leedsichthys had a large head with bosses on the skull roof. Fossilised bony fin rays show large elongated pectoral fins and a tall vertical tail fin. The gill arches were lined by gill rakers, equipped by a unique system of delicate bone plates, that filtered plankton from the sea water, the main food source. Along with its close pachycormid relatives Bonnerichthys and Rhinconichthys, Leedsichthys is part of a lineage of large-sized filter-feeders that swam the Mesozoic seas for over 100 million years, from the middle Jurassic until the end of the Cretaceous period. Pachycormids might represent an early branch of Teleostei, the group most modern bony fishes belong to; in that case Leedsichthys is the largest known teleost fish. Collectible Wildlife Gifts is the market leader in providing high quality, realistic toys of all types! Every one of our items is heavily inspected for quality craftsmanship and authenticity. Our products make great gifts for your family and friends! Additionally, our lifelike animal figurines and plush make for great displays and educational sets. We are happy to serve our wide range of clientele from parents to educators, gift shop owners and many more! Our team works hard to ensure you get a great toy. All products from CWG are checked for quality to ensure you receive the order in perfect condition. From plush sharks to educational animal growths cycle we offer the perfect toy or gift for any occasion. Our products have been ordered by educational groups, aquariums, zoos, and more. Great customer service is guaranteed when you order from Collectible Wildlife Gifts, we want you to love your toy and have a simple ordering process, we are happy to assist with inquiries!
Price: 7.89 USD
Location: Bremerton, Washington
End Time: 2024-10-31T17:36:20.000Z
Shipping Cost: N/A USD
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Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
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Brand: K&M
