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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 giant leatherback sea turtle, the largest extant turtle, digs a nest on the beach. The largest extant turtle is the leatherback sea turtle (Dermochelys coriacea), reaching a maximum total length of 3 m (10 ft) and a weight of 961 kg (2,119 lb). [1] [96] The second-largest extant testudine is the Loggerhead sea turtle. It tends to weight ...
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.
Type specimen (YPM 3000) of Archelon ischyros in the Yale Peabody Museum, Yale University. In 1895, George Wieland discovered YPM 3000, the nearly complete and articulated type specimen of the giant sea turtle now known as Archelon ischyros, which had been preserved in the Pierre Shale.
The largest seems to be Archelon ischyros, which reached a length of 4.84 m (16 ft) across the flippers and a weight of 2,200 kg (4,500 lb). (Terrestrial)A much larger tortoise survived until about 2000 years ago, Meiolania at about 2.5 m (8.4 ft) long and well over a ton.
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]
Mounted fossilized skeleton of the Late Cretaceous sea turtle Archelon †Archelon – type locality for genus †Archelon ischryos †Archelon ischyros – type locality for species †Artocarpus – report made of unidentified related form or using admittedly obsolete nomenclature †Artocarpus lessigiana; Aspideretes †Asplenium ...