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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. It is known only from the Pierre Shale and has one species, A. ischyros.
Protostegidae is a family of extinct marine turtles that lived during the Cretaceous period. The family includes some of the largest sea turtles that ever existed. The largest, Archelon, had a head one metre (39 in) long.
The largest freshwater turtle seems to be Stupendemys, with an estimated parasagittal carapace length of 2.86 m (9 ft 5 in) and weight of up to 1,145 kg (2,524 lb). [112] A close contender is Archelon ischyros, a sea turtle, which reached a length of 5 m (16 ft) and a weight of 2,200 kg (4,900 lb). [113]
The largest known turtle ever was Archelon ischyros at 5 m (16 ft) long and 2,200 kg (4,900 lb). [283] Possible second-largest sea turtle was Protostega at 3.9 m (13 ft) in total body length. [284] [285] There is even a larger specimen of this genus from Texas estimated at 4.2 m (14 ft) in total length.
The lower and upper bounds lie between approximately 1.40–2.16 m (4 ft 7 in – 7 ft 1 in). While this would put the total length of Peltocephalus maturin below those of giants like Archelon and Stupendemys , it would still be one of the largest freshwater turtles in terms of carapace length, matched only by Carbonemys (estimated straight ...
This exceeds the size of the Vienna-specimen of the Cretaceous sea turtle Archelon, the largest known turtle, (carapace length 2.20 meters). [ 4 ] The weight of Stupendemys was estimated based on the straight carapace length, with calculations indicating a weight of 871 kg for CIAAP-2002-01 and 744 kg for MCZ(P)-4376, the former largest known ...
The largest known turtle was Archelon ischyros, a Late Cretaceous sea turtle up to 4.5 m (15 ft) long, 5.25 m (17 ft) wide between the tips of the front flippers, and estimated to have weighed over 2,200 kg (4,900 lb). [10]
Megalochelys ("great turtle") is an extinct genus of tortoises that lived from the Miocene to Pleistocene.They are noted for their giant size, the largest known for any tortoise, with a maximum carapace length of over 2 m (6.5 ft) in M. atlas.