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Mosasaurus (/ ˌ m oʊ z ə ˈ s ɔːr ə s /; "lizard of the Meuse River") is the type genus (defining example) of the mosasaurs, an extinct group of aquatic squamate reptiles.It lived from about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
The second species named in 1904, B. isis, lived in the region currently known as the Mediterranean Sea, with fossils found in North Africa and Jordan. Basilosaurus is thought to have been one of the largest animals of the Paleogene , with the type species B. cetoides measuring around 17–20 metres (56–66 ft) long and weighing up to 15 ...
The Turonian-aged skull of T. sp. aff. kansasensis (SGM-M1) is one of the oldest known fossils of Tylosaurus. Tylosaurus was among the earliest derived mosasaurs. The oldest fossil attributable to the genus is a premaxilla ( TMM 40092-27) recovered from Middle Turonian deposits of the Arcadia Park Shale in Texas , [ 2 ] which is dated between ...
Sea snakes: the most abundant of the marine reptiles, there are over 60 different species of sea snakes. They inhabit the tropical and subtropical waters of the Indian and Pacific oceans , though very limited reports of sightings suggest they may be extending into the Atlantic Ocean .
Hylonomus (/ h aɪ ˈ l ɒ n əm ə s /; hylo-"forest" + nomos "dweller") [2] is an extinct genus of reptile that lived during the Bashkirian stage of the Late Carboniferous.It is the earliest known crown group amniote and the oldest known unquestionable reptile, with the only known species being Hylonomus lyelli.
Thalattosauria (Greek for "sea lizards") is an extinct order of marine reptiles that lived in the Middle to Late Triassic.Thalattosaurs were diverse in size and shape, and are divided into two superfamilies: Askeptosauroidea and Thalattosauroidea.
Cryptovaranoides was recovered in the study as a crown-group anguimorph, and therefore the oldest crown group-squamate, 35 million years older than any previously known crown-group squamate. [3] However, a 2023 study found that Cryptovaranoides most likely represents an archosauromorph that was only distantly related to squamates.
Prior to their description, the oldest known amniote fetuses were from the Triassic. [ 19 ] One isolated coiled fetus called FC-DPV 2504 is not surrounded by calcareous eggshells, suggesting that the glands in the oviduct of Mesosaurus and probably all Paleozoic amniotes were not able to secrete calcium carbonate , in contrast to post-paleozoic ...