The turtle barnacle has been identified as Chelonibia testudinaria (Linnaeus, 1758), a widespread, commensal species found on all genera of Cheloniidae
in the world's oceans.
The general shape and proportions of the neurals, however, matches only the turtles of the Family Cheloniidae, which includes all living sea turtles (except the highly specialized Dermochelys coriacea).
The overall neural shape is similar to all recent taxa of Cheloniidae except Lepidochelys.
The other chelonioid families are Cheloniidae
, which include hawksbill, loggerhead and other marine turtles, and the Dermochelyidae, represented by a lone species of leatherback turtles.
Therefore, I believe this turtle represents a distinct taxon of eucryptodire that may be close to, or within, the family Cheloniidae