Mosasaurus is a genus of mosasaurs, extinct carnivorous aquatic lizards. It existed during the Maastrichtian age of the late Cretaceous period, between about 70 and 66 million years ago, in western Europe and North America. The name means “Meuse lizard”, as the first specimen was found near the Meuse River.
A distinguishing characteristic of Tylosaurus is its elongated, cylindrical premaxilla (snout) from which it takes its name and which may have been used to ram and stun prey and also in intraspecific combat. Early restorations showing Tylosaurus with a dorsal crest were based on misidentified tracheal cartilage, but when the error was discovered, depicting mosasaurs with such crests was already a trend
Elasmosaurus from Greek elasmos ‘thin plate’ (referring to thin plates in its pelvic girdle) + σαυρος sauros ‘lizard’) is a genus of plesiosaur with an extremely long neck that lived in the Late Cretaceous period (Campanian stage), 80.5 million years ago.
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).
Livyatan is an extinct genus of physeteroid whale, similar in size to the modern sperm whale. It contains the single species L. melvillei. It lived during the Tortonian stage of the Miocene epoch, about 9.9-8.9 million years ago (Mya), though evidence from Australia implies that either it or a close relative survived into the Zanclean stage of the Pliocene, around 5 Mya.
Leedsichthys is a giant member of the Pachycormidae, an extinct group of Mesozoic ray-finned fish that lived in the oceans of the Middle Jurassic period.
Basilosaurus is a genus of early whales that livedin the late Eocene. The first fossil of B. cetoides was discovered in the United States and was initially believed to be some sort of reptile, hence the suffix -“saurus”, but it was later found to be a marine mammal.
Megalodon meaning “big tooth” is an extinct species of shark that lived approximately 23 to 2.6 million years ago, during the Cenozoic Era (Early Miocene to the end of the Pliocene)
The southern right whale (Eubalaena australis) is a baleen whale, one of three species classified as right whales belonging to the genus Eubalaena. Approximately 10,000 southern right whales are spread throughout the southern part of the Southern Hemisphere.
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whales (Mysticeti). At up to 29.9 metres (98 ft) in length and with a maximum recorded weight of 173 tonnes (191 short tons) and probably reaching over 181 tonnes (200 short tons), it is the largest animal known to have ever existed.
Check out the video for Top 10 Biggest Sea Animals of All Time!