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Marine Reptiles of the Past
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http://blogs.scientificamerican.com/tetr...book-Share
Between the later part of the Triassic and the very end of the Cretaceous, the seas of the world (and some of its rivers, lakes and estuaries as well) were inhabited by the remarkable group of swimming reptiles known as the plesiosaurs.   *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author Kronosaurus ( KRON-o-SAWR-əs; meaning "lizard of Kronos") is an extinct genus of short-necked pliosaur. With an estimated length of 9–10.5 metres (30–34 ft), it was among the largest pliosaurs, and is named after the leader of the Greek Titans, Cronus. It lived in the Early Cretaceous Period (Aptian-Albian). Fossil material has been recovered from Queensland in Australia, and from the Paja Formation in Boyacá, Colombia, and assigned to two species. Kronosaurus queenslandicus was estimated to weight up to 11.000 kg. The massive, crested skull of the Harvard specimen measures 110,7 inches (more than 9 feet) long, which makes it more than twice as long as that of Tyrannosaurus whose skull has been measured at 52 inches, the early Cretaceous Kronosaurus was one of the largest marine reptiles and certainly one of the most terrifying predators that ever lived. Its massive jaws held an array of teeth that were 30 centimeters long with 12 centimeters crowns long equaled today only by lower jaw teeth of sperm whales. Book Sea Dragons predators of the prehistoric oceans (Richard Ellis)
Kronosaurus
 *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author Credits to @prehistoricpast and pictures taken in Harvard Museum of Natural History by @abel_ramirez and @jakepeppard
Mosasaurs (from Latin Mosa meaning the 'Meuse river', and Greek σαύρος sauros meaning 'lizard') are an extinct group of large marine reptiles. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards known as aigialosaurs in the Early Cretaceous. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago.
Mosasaurs breathed air, were powerful swimmers, and were well-adapted to living in the warm, shallow inland seas prevalent during the Late Cretaceous period. Mosasaurs were so well adapted to this environment that they gave birth to live young. Coloration: The coloration of mosasaurs was unknown until 2014, when the findings of Johan Lindgren of Lund University and colleagues revealed the pigment melanin in the fossilized scales of a mosasaur. Mosasaurs were likely countershaded, with dark backs and light underbellies, much like a great white shark or leatherback sea turtle, the latter of which had fossilized ancestors for which color was also determined. Description: The smallest-known mosasaur was Dallasaurus turneri, which was less than 1 m (3.3 ft) long. Larger mosasaurs were more typical, with many species growing longer than 4 m (13 ft). Mosasaurus hoffmannii, the largest known species, may have reached up to 17 m (56 ft) in length. Picture of skull credit to Carter County Museum, Skeleton in Perot Museum credit to Noureen Roarr, picture of Skeleton credit to Adi Gunawan Manikam and credit to Johnny Andrade.  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author
Picture of the largest publicly exhibited mosasaur skeleton in the world displayed at the Canadian Fossil Discovery Centre in Morden, Manitoba. The specimen, nicknamed "Bruce", is just over 13 m (43 ft) long. Credit to Keswick`s Canada
 *This image is copyright of its original author  *This image is copyright of its original author
Liopleurodon, is a genus of large, carnivorous marine reptile belonging to the Pliosauroidea, a clade of short-necked plesiosaurs. The two species of Liopleurodon lived during the Callovian stage of the Middle Jurassic Period (c. 160 to 155 mya). It was the apex predator of the Middle to Late Jurassic seas that covered Europe. The largest species, L. ferox, is estimated to have grown up to 6.39 metres (21.0 ft) in length.
Liopleurodon fossils have been found mainly in England and France, with one younger species known from Russia. Fossil specimens that are contemporary (Callovian) with those from England and France referrable to Liopleurodon are known from Germany. Currently, there are two recognized species within Liopleurodon. From the Callovian of England and France L. ferox is well known; while also from the Callovian of England is the rarer L. pachydeirus, described by Seeley as a Pliosaurus (1869). Only L. ferox is known from more or less complete skeletons. Liopleurodon ferox first came to the public attention in 1999 when it was featured in an episode of the BBC television series Walking with Dinosaurs, which depicted it as an enormous 25 m (82 ft) long predator; this was based on very fragmentary remains, for the sake of being more 'spectacular' to television audiences, and considered to be an exaggeration for Liopleurodon, with the calculations of 20-metre specimens generally considered dubious. The error persisted in the 2003 spin-off Sea Monsters. However, new research and the finding of a complete skeleton of L. ferox show that their skulls were actually about one-fifth of their total body length, which suggests a maximum known total body length of 6.39 m (21.0 ft) based on NHM R3536, the largest known skull at 1.26 m (4.1 ft) in condylobasal length (1.54 m (5.1 ft) in overall length. Credit of the paint to @prehistoricpast  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author
 (09-01-2017, 08:39 AM)epaiva Wrote: Absolutely a bad-ass predator!!! Another in a long line of mind boggling prehistoric creatures.
Kronosaurus
Credit to @christianreno01  *This image is copyright of its original author
The "Mosasaurus", one of the king of the Cretaceous seas that might be diabolical
http://www.prehistoric-wildlife.com/spec...aurus.html  *This image is copyright of its original author
A good video by Johnnie Morgan, despite the title "Mosasaurus, "T-Rex of the deep" (overstatement) :
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