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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.
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 known turtle ever was Archelon ischyros at 5 m (16 ft) long and 2,200 kg (4,900 lb). [280] Possible second-largest sea turtle was Protostega at 3.9 m (13 ft) in total body length. [281] [282] There is even a larger specimen of this genus from Texas estimated at 4.2 m (14 ft) in total length.
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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.
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 ...
Stupendemys is the largest known species of freshwater turtle currently known to science, with several specimens reaching a carapace length exceeding 2 meters. The largest specimen of Stupendemys is CIAAP-2002-01, an almost complete carapace with a parasagittal length of 2.86 meters.