Nature · Upper AMNH species length reference
How long is a apatosaurus louisae?
The American Museum of Natural History gives Apatosaurus louisae a length range of 22 to 24 meters. This scene selects the upper end of that species reference.

≈ 24 m
Sourced measurement- Measurement
- Upper AMNH species length reference · approximately 24 meters
- Subject or version
- Upper AMNH species length reference
- Using this value
- A starting value for the illustration, not a universal or confirmed height.
Add more subjects or change the units in the playground.
A little more perspective
AMNH’s species facts list 22 to 24 meters long. The selected 24 meters is the upper end of that range, not an independently measured maximum or the exact length of the museum’s steel-and-fiberglass biomechanics model.
The extended neck and complete whip-like tail make whole-body length visible. The thick neck and robust torso distinguish this restoration from the slimmer Diplodocus. Soft tissues, skin and internal segment proportions are interpretive; the horizontal measurement does not specify standing height.
Quick facts
The American Museum of Natural History gives Apatosaurus louisae a length range of 22 to 24 meters. This scene selects the upper end of that species reference.
For a presentation or a research note, include the subject, the measurement definition, and the assumed measurement. A picture alone cannot explain those choices. The comparison guide explains how to export an image and its source notes together.
Sources and measurement notes
Twenty-four meters is the upper end of a museum species-length range.
Source review recorded . Maintained by Ishan Karunaratne. Suggest a correction with a source and the exact measurement being compared.