The species was originally described by Carl Linnaeus in his landmark 1758 10th edition of "Systema Naturae" as "Testudo mydas". In 1868, Marie Firmin Bocourt named a particular species of sea turtle "Chelonia agassizii", in honor of Swiss-American zoologist Louis Agassiz. This "species" was referred to as the "black sea turtle". Later research determined Bocourt's "black sea turtle" was not genetically distinct from "C. mydas", and thus taxonomically not a separate species. These two "species" were then united as "Chelonia mydas" and populations were given subspecies status: "C. mydas mydas" referred to the originally described population, while "C. mydas agassizi" referred only to the Pacific population known as the Galápagos green turtle. This subdivision was later determined to be invalid and all species members were then designated "Chelonia mydas". The oft-mentioned name "C. agassizi" remains an invalid junior synonym of "C. mydas".