|Named By:||Rainer Zangerl in 1953|
|Time Period:||Early Cretaceous-Late Cretaceous, 120-70 Ma|
|Location:||USA - Alabama - Selma Formation|
|Size:||Around 30 centimetres long|
|Fossil(s):||At least two specimens|
|Classification:||| Chordata | Reptilia | Testudines | Cryptodira | Protostegidae | Chelospharginae ||
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. Like most sea turtles, they had flattened bodies and flippers for front appendages; protostegids had minimal shells like leatherback turtles of modern times.