SauropodomorphaDiplodocinaeAMNH 223

Diplodocus hallorum

AMNH 223

Known skeletal material of Diplodocus hallorum AMNH 223 — elements preserved drawn in white against a black body silhouette, estimated length ~28 m
Known material · Scale bar = 1 meter
Taxon
Diplodocus hallorum (Gillette, 1991)
Specimen
AMNH 223
Repository
American Museum of Natural History
Formation
Morrison Formation
Estimated length
~27.5 m (90 feet)
View
Left lateral
Basis
Known material only — formerly referred to Diplodocus longus
Drawing
© Scott Hartman
Drawn
2006, revised 2026

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For most of a century AMNH 223 was referred to Diplodocus longus — the genus’s original type species. But the D. longus holotype is too incomplete to diagnose, so the name lost its standing, and specimens once placed under it have been reassigned; AMNH 223 now falls within Diplodocus hallorum, the species it most closely resembles. At an estimated ~27 m it sits just shy of the NMMNH holotype.

As with the holotype, the page shows only what the specimen preserves — the recovered elements in white against a body silhouette — rather than a full reconstruction.

Other Diplodocus hallorum specimens

Known skeletal material of Diplodocus hallorum NMMNH 3690 — elements preserved drawn in white against a black body silhouette, estimated length ~30 m
NMMNH 3690

← all Diplodocus hallorum specimens