A sauropod from the Late Jurassic epoch had the longest neck of any dinosaur on record – stretching 15.1 metres, based on analysis of its vertebrae.

These cervical vertebrae, from the sauropod Giraffatitan brancai, are subtly distorted. (Image credit: Michael P. Taylor; CC BY 4.0) ...

Micro-CT scan of the posterior (eighth) cervical vertebra of the unaysaurid sauropodomorph Macrocollum (CAPPA/UFSM 0001b) in cross-section (a–k) and lateral views (l, m).

This Dinosaur Had a 50-Foot-Long Neck, Scientists Say They compared vertebrae discovered in 1987 to more complete remains to make this new estimate Will Sullivan - Daily Correspondent March 17, 2023 ...

After M. sinocanadorum, the next longest-necked dinosaur is Xinjiangtitan shanshanesis, a mamenchisaurid that boasts the most complete preserved neck on record at 43.9 feet (13.4 m), Moore said.

Micro-CT scan of the posterior (eighth) cervical vertebra of the unaysaurid sauropodomorph Macrocollum (CAPPA/UFSM 0001b) in cross-section (a–k) and lateral views (l, m).

For the long-necked dinosaurs called sauropodomorphs, evolving a long neck didn’t happen all at once. Sauropodomorphs, a group that includes titans such as Apatosaurus and Argentinosaurus, are ...

It may have been a stiff extension of the vertebra, often called a cervical rib, that would have run the length of the neck, bolstering its lightweight bones like a brace.