Terlinguachelys fischbecki is an extinct sea turtle that existed during the Late Cretaceous period some 80 million years ago. It is the sole species in the genus Terlinguachelys and is classified in the family Protostegidae along with other extinct marine turtles. The species was discovered in 1987. A lone specimen was unearthed from rocks located in the Aguja Formation of Texas, dated to be from Campanian deposits of the Late Cretaceous period. The type specimen, labeled as TMM 43072-1, consists of an incomplete turtle skeleton including parts of the skull, carapace and limbs.