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Evolution of Life - Ichthyosauria 500...
Evolution of Life - Ichthyosauria 500 Tugriks (Tögrög) 1oz .999 pure silver coin, partial rose-gold finish, high relief, antique finish.
Third coin in series, now presents the Mesozoic era period with a stunning, partially excavated ichthyosaur, which is based on a old fossil.
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|
Ichthyosaurs (Greek for "fish lizard" – ιχθυς or ichthys meaning "fish" and σαυρος or sauros meaning "lizard") are large marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria).
Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared approximately 250 million years ago (mya) and at least one species survived until about 90 million years ago, into the Late Cretaceous. During the early Triassic Period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development parallel to that of the ancestors of modern-day dolphins and whales, which they gradually came to resemble in a case of convergent evolution. They were particularly abundant in the later Triassic and early Jurassic Period, until they were replaced as the top aquatic predators by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous Period. In the Late Cretaceous, ichthyosaurs became extinct for unknown reasons.
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