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In 1994, Hirayama proposed a three-family subdivision of the sea turtle superfamily based on cladistic analysis; Protostegidae was given full, formal family status in the system, containing most of the extinct genera, including Archelon, and a previously undescribed protostegid. [16]
Ocepechelon is an extinct genus of giant protostegid sea turtle known from the Late Cretaceous (late Maastrichtian stage, 67 Myr) of Morocco. The feeding apparatus of Ocepechelon, a bony pipette-like snout, is unique among tetrapods and shares unique convergences with both syngnathid fishes (unique long tubular bony snout ending in a rounded and forward directed mouth) and beaked whales (large ...
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]
Desmatochelys is hypothesized to have laid rigid eggs instead of the soft-shelled eggs typical of extant marine turtles, as a closely related protostegid has been shown to do. [20] The fossils discovered in 2007 represent an almost complete skeleton. There are four skulls, two are complete and the others are nearly complete.
Like later sea turtles though, Santanachelys had large salt glands situated near its eyes, which aided in the excretion of excess salt. This was an adaptation to the highly saline marine environment. [1] Evolutionarily, the morphology of Santanachelys is typical of what is expected of an early sea turtle. The front appendages not being fully ...
Cratochelone bernedi is one of three protostegid sea turtle taxa described from the fossil record of Australia. Described in 1885 Notochelone costata is the smallest species, while the most recently described species Bouliachelys suteri , is between Notochelone and Cratochelone in size.
Rhinochelys is an extinct genus of sea turtles belonging to the family Protostegidae. Fossil records
Bouliachelys is an extinct genus of sea turtle from Cretaceous Australia. It was originally described as a member of Protostegidae. [1] In 2013 study it was considered to be a member of Dermochelyoidae, [2] although later studies consider it as a protostegid again. [3] [4]