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and the last species
This specimen and species were renamed Ctenochasma elegans
Mississippian System of Classification
dome-headed
thighs and legs
Protostega gigas Fossil Sea Turtle Skull Stegosaurus and the last speciesProtostega gigas Fossil Sea Turtle Skull Protostega meaning (first roof) is an extinct genus of marine turtle containing a single species, Protostega gigas. Its fossil remains have been found in the Smoky Hill Chalk formation of western Kansas dated to 83. 5 million years ago. Fossil specimens of this species were first collected in 1871, and named by Edward Drinker Cope in 1872. With a length of 3 meters (9. 8 ft.), it is the second largest sea
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