description Brachiosaurus altithorax (FMNH P25107) Overview
FMNH P25107 is the holotype specimen of Brachiosaurus altithorax, a large sauropod dinosaur from the Late Jurassic Morrison Formation of Colorado. Elmer Riggs and his field team collected the partial skeleton in 1900, and Riggs named the species in 1903. The specimen, held by Chicago's Field Museum, established the genus as a long-forelimbed sauropod with proportions distinct from many other large Jurassic dinosaurs.
help Brachiosaurus altithorax (FMNH P25107) FAQ
What bones are preserved in Brachiosaurus specimen FMNH P25107?
The holotype is a partial skeleton that includes the right humerus, right femur, parts of the pelvis, vertebrae, and ribs. Its incomplete condition means that many familiar full-body reconstructions combine this material with evidence from related sauropods.
Where was FMNH P25107 discovered?
Elmer Riggs and a Field Columbian Museum expedition collected it near Grand Junction, Colorado, in 1900. The bones came from the Late Jurassic Morrison Formation.
Why did Elmer Riggs name the dinosaur Brachiosaurus altithorax?
Brachiosaurus refers to the animal's unusually long upper arm, which helped give it a high-shouldered body profile. Altithorax refers to its deep chest, another feature Riggs recognized when naming the species in 1903.
Is the mounted Brachiosaurus in Chicago made entirely from FMNH P25107?
No, the holotype is far too incomplete to provide every bone in a full mount. Museum displays and reconstructions supplement its known anatomy with casts and evidence from closely related brachiosaurids.
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