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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.
ARCHELON is a partner to the UNEP Mediterranean Action Plan, and is hosting the 2006 International Sea Turtle Conference.Despite working with major national and international bodies, ARCHELON relies heavily on the work of volunteers, of which there are some 400 each year.
Three species of Rhinochelys are recognized: [1] [3]. Rhinochelys pulchriceps (Owen, 1851); Rhinochelys amaberti Moret, 1935; Rhinochelys nammourensis Tong, Hirayama, Makhoul & Escuillie, 2006 [4]
Leviathanochelys is an extinct genus of giant sea turtle from the Middle Campanian of northern Spain.Although only known from the rear end of the carapace and the connecting pubic bones, these elements clearly show that they belonged to a turtle of great size, comparable in dimensions to the giant Archelon and Protostega from the Western Interior Seaway of the USA.
Stupendemys skull. The skull of Stupendemys is roughly triangular in top view and the edges of the jaws converge at the front of the snout in a straight edge. The skull is dorsally extremely inflated by the prefrontals that make up a large area of the front region of the skull, forming a vertical wall above the bony nostril.
In contrast to their earth-bound relatives, tortoises, sea turtles do not have the ability to retract their heads into their shells. Their plastron, which is the bony plate making up the underside of a turtle or tortoise's shell, is comparably more reduced from other turtle species and is connected to the top part of the shell by ligaments without a hinge separating the pectoral and abdominal ...
Protostega ('first roof') [1] is an extinct genus of sea turtle containing a single species, Protostega gigas.Its fossil remains have been found in the Smoky Hill Chalk formation of western Kansas (Hesperornis zone, dated to 83.5 million years ago [2]), time-equivalent beds of the Mooreville Chalk Formation of Alabama [3] and Campanian beds of the Rybushka Formation (Saratov Oblast, Russia). [4]