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Largest prehistoric organisms Notes ^ Carbonated bio apatite from a megalodon tooth (of unknown source location) dated to 5.75 ± 0.9 Ma in age has been analyzed for isotope ratios of oxygen ( 18 O/ 16 O) and carbon ( 13 C/ 12 C), using a carbonate clumped-isotope thermometer methodology to yield an estimate of the ambient temperature in that ...
The largest prehistoric horse was Equus giganteus of North America. It was estimated to grow to more than 1,250 kg (1.38 short tons) and 2 m (6 ft 7 in) at the shoulders. [138] The largest anchitherine equid was Hypohippus at 403 to 600 kg (888 to 1,323 lb), comparable to large modern domestic horses.
List of prehistoric chitons; List of prehistoric foraminifera genera; List of ichthyosaur genera; List of marine gastropod genera in the fossil record; List of plesiosaur genera; List of prehistoric malacostracans; List of prehistoric medusozoan genera; List of prehistoric nautiloid genera; List of prehistoric ostracod genera; List of ...
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 metric tons (17 short tons). It was the top predator of its environment in the shallows of the inland sea, preying on sharks, large fish and other marine mammals.
Scientists consider the blue whale, which grows up to 110 feet (33.5 meters) long, to be the largest known animal ever to exist on the planet. But it’s possible that the 202 million-year-old ...
The Lapitiguana is the largest iguana fossils. The extant members of genus Brachylophus are iguanas small and medium-sized, growing a length of 60–75 cm (24–30 in). ). Although, in the past there was a much larger member of this family – Brachylophus gibbonsi, reached in length of 1.2 m (3.9 ft), [citation needed] and thus, was 1.8 times longer than its modern re
Archelon is an extinct marine turtle from the Late Cretaceous, and is the largest turtle ever to have been documented, with the biggest specimen measuring 4.6 m (15 ft) from head to tail and 2.2–3.2 t (2.4–3.5 short tons) in body mass.
Pages in category "Prehistoric marine animals" The following 38 pages are in this category, out of 38 total. This list may not reflect recent changes. .