SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: CHELONOMORPHA KUHN, 1960

SUPERCOHORT: TESTUDINES LINNAEUS, 1758

COHORT: CASICHELYDIA emend GAFFNEY & MEYLAN, 1988

MAGANORDER: CRYPTODIRA GAFFNEY & MEYLAN, 1988

SUPERORDER: SELMACRYPTODIRA GAFFNEY, HUTCHISON, JENKINS & MEEKR, 1987

GRANDORDER: DAIOCRYPTODIRA GAFFNEY & MEYLAN, 1988

MICRORDER: CENTROCRYPTODIRA GAFFNEY & MEYLAN, 1988

ORDER: POLYCRPTODIRA GAFFNEY & MEYLAN, 1988

SUBORDER: PROCOELOCRYPTODIRA GAFFNEY & MEYLAN, 1988

INFRAORDER: CHELONOIDEA GAFFNEY & MEYLAN, 1988

Superfamily: DERMOCHELYOIDEA Willams, 1950

Family: PROTOSTEGIDAE Cope, 1889

Subfamily: PROTOSTEGINAE Cope, 1889

Tribe: PROTOSTEGINI Cope, 1889 (sensu Hooks, 1998)

Subtribe: PROTOSTEGINA Cope, 1889 (sensu Hooks, 1998)

Archelon ischyros
= Protostega ischyros