Longest dinosaur
- Who
- Seismosaurus halli
- What
- 39 – 52 metre(s)
- When
- 01 January 0001
The longest vertebrate on record was a diplodocid excavated in 1980 from New Mexico, USA named Seismosaurus halli, estimated to be 39–52 m. (128–170 ft) long based on comparisons of individual bones. In 1999, the bones were reconstructed at the Wyoming Dinosaur Center, to measure a total length of 41 m. (134.57 ft). It was disassembled in August 1999 to tour the States.
Based on the evidence of footprints, the brachiosaurid Breviparopus may have attained a length of 48 m 157 ft.
Previously, the longest dinosaur known from a complete skeleton was the diplodocid Diplodocus carnegii (double beam), assembled at the Carnegie Museum in Pittsburgh, Pennsylvania, USA from remains found in Wyoming in 1899. Diplodocus was 26.6 m 87 ft 6 in long, with much of that length made up by a long neck and an extremely long whip-like tail, and probably weighed 5.8–18.5 tonnes, with an estimate of around 12 tonnes being the most likely. The mounted skeleton was so spectacular that casts were requested by other museums, and copies may be seen in London, La Plata, Washington, Frankfurt and Paris.
Based on the evidence of footprints, the brachiosaurid Breviparopus may have attained a length of 48 m 157 ft.
Previously, the longest dinosaur known from a complete skeleton was the diplodocid Diplodocus carnegii (double beam), assembled at the Carnegie Museum in Pittsburgh, Pennsylvania, USA from remains found in Wyoming in 1899. Diplodocus was 26.6 m 87 ft 6 in long, with much of that length made up by a long neck and an extremely long whip-like tail, and probably weighed 5.8–18.5 tonnes, with an estimate of around 12 tonnes being the most likely. The mounted skeleton was so spectacular that casts were requested by other museums, and copies may be seen in London, La Plata, Washington, Frankfurt and Paris.