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Evolution of Life - Pterosauria 500...
Evolution of Life - Pterosauria 500 Tugriks (Tögrög) 1oz .999 pure silver coin, partial gold finish, high relief, antique finish.
Fourth coin in series, portrays the native Noripterus parvus, that roamed Mongolian skies 140 million years ago with a wingspan of over 4 m. Their fossils were first described from Central Mongolia in 1982.
Mintage: only 999 pieces worldwide. With wooden box and COA.
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|Face Value :||500 Tugriks|
|Metal :||.999 Fine silver|
|Weight :||1 oz|
|Size :||38.61 mm|
|Quality :||Proof antique finish|
|Mintage :||Only 999 pcs. worldwide|
|Series :||Evolution of Life|
|Certificate of Authenticity :||Yes|
|Original ETUI box/case :||Yes|
Pterosaurs (/ˈtɛrəˌsɔːr, ˈtɛroʊ-/; from the Greek πτερόσαυρος, pterosauros, meaning "winged lizard") were flying reptiles of the extinct clade or order Pterosauria. They existed during most of the Mesozoic: from the late Triassic to the end of the Cretaceous (228 to 66 million years ago). Pterosaurs are the earliest vertebrates known to have evolved powered flight. Their wings were formed by a membrane of skin, muscle, and other tissues stretching from the ankles to a dramatically lengthened fourth finger.
Early species had long, fully toothed jaws and long tails, while later forms had a highly reduced tail, and some lacked teeth. Many sported furry coats made up of hair-like filaments known as pycnofibers, which covered their bodies and parts of their wings. Pterosaurs spanned a wide range of adult sizes, from the very small anurognathids to the largest known flying creatures of all time, including Quetzalcoatlus and Hatzegopteryx.
Pterosaurs are often referred to in the popular media and by the general public as "flying dinosaurs", but this is scientifically incorrect. The term "dinosaur" is restricted to just those reptiles descended from the last common ancestor of the groups Saurischia and Ornithischia (clade Dinosauria, which includes birds), and current scientific consensus is that this group excludes the pterosaurs, as well as the various groups of extinct marine reptiles, such as ichthyosaurs, plesiosaurs, and mosasaurs.
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