The Anticipatory Erratum to 'Sappho Wrote the Dinosaurs', deposit #1598 of the Crimson Hexagonal Archive (8 September 2026), establishes a genre: an erratum issued before the work it corrects, in the ordinary form and at the ordinary time. Its governing sentence is that the interpretation has been withdrawn and the work will nevertheless appear, since its publication was necessary to discover why. The withdrawn interpretation holds that Sappho wrote the dinosaurs — 'wrote' meaning to establish a relation among materials whose prior existence does not explain their present arrangement, and 'Sappho' naming the point at which an absent body acquires a means of acting upon the bodies that survive it. The erratum withdraws the conclusion, the chronology, the attribution and the account of what would count as evidence, and retains the title on the ground that removing the dinosaurs would create an obvious gap in the argument. Its central demonstration is the museum experiment: a caption adequate to a reconstructed skeleton — of the body, these portions survive; the remainder follows the arrangement judged most probable; several restorations remain disputed — is adequate without alteration to a fragmentary lyric. This establishes not common authorship but that the institutional apparatus can move between the two objects without changing its account of what it has done. The objection from scale is refused on the ground that lyric's characteristic unit is not the short line but the world altered by an absence, and that a creature capable of occupying so much space has become incapable of occupying any; a museum therefore exhibits absence at full scale, which the erratum calls the most persuasive sentence in the work and retracts first. The piece stands in the archive's future-reader line and pushes it past its evidence deliberately: it is one of ten claims on a slate of anticipatory errata, each a real position of the archive taken one step beyond what it can carry.