8 times longer than the neck of a heron
In a study published this week in the Journal of Systematic paleontology, researchers estimated that the Mamenchisaurus was up to 15.24m long.
Mamenchisaurus's bicycle is longer than a regular school bus. The species' tectonic gland is estimated to be the longest of all sauropod annual snails and may be the longest-tailed animal on Earth.
In 1987, paleontologists discovered part of the skeleton of the sauropod khung worm that emerged from the red sandstone of the Shishugou strata in northwest China.
Dinosaur fossil evidence was evidence of debris, including lower jaw, some skulls and some vertebrae. The fossil shows a giant animal that wintered in the muddy flat area for 162 million years, along with the primitivebikes.
This species of khungone is named Mamenchisaurus sinocanadorum and is associated with a number of other long-standing khungones from East Asia.
However, the real size of Mamenchisaurus is still a mystery. The lack of any other fossil of this mineral makes scientists have just a few vertebrae to check.
The particularly interesting and upsetting thing about sauropod pathology is that sometimes the longest remains belong to the least-known things in the fossil data, which is the simple reason why it is difficult to bury such a large thing, says Dr Andrew Moore, a paleontologist at Stony Brook University in the United States, a sauropod pathologist.
Therefore, Dr. Moore has found the remains of some relatives of Mamenchisaurus, especially Xinjiangtitan, a slightly older sauropod discovered in northwestern China in 2013.
Notably, the researchers have excavated the entire spine of Xinjiangtitan. With a length of nearly 13.41m, it is considered the longest and most complete neck in fossil data.
Using these samples, we can expand the scale and make a fairly accurate estimate of the shape of the species Mamenchisaurus, says Dr. Moore.
After comparing Mamenchisaurus and Xinjiangtitan, Dr. Moore and his colleagues concluded that Mamenchisaurus has a neck up to 15.24m long. The neck will take up about half of the total estimated length of the body and is equivalent to more than 8 necks of a long-standing heron stacked on top of each other.
Special ancient structure
To determine how Mamenchisaurus controls such a long neck, Dr. Moore and his colleagues used a CT scanner to analyze their spines.
Instead of marrow and tissue, the inside of the dinosaur's vertebrae is filled with large air sacs like in storks and thunderstorms. These airbags account for up to 77% of the volume of each bone, significantly reducing the weight of the spine of the Mamenchisaurus.
Dr. Cary Woodruff - an entomologist at the Frost Museum of Science in Miami (USA), who specializes in research on herring-legged Dinosaurs - said that reducing the weight on the neck is necessary for all sauropods.
Such a long neck carries a lot of weight that you dont want to have on your body, says Dr. Woodruff.
Although its vertebrae are empty, the neck of the Mamenchisaurus is not weak. During the excavation, paleontologists initially discovered a pair of fossil bone tissue several meters long.
This can be an extension of the vertebrae, commonly known as the cervical vertebrae, running along the length of the neck, supporting the bones lightly. While this reduces the flexibility of the neck, these ribs help keep the neck structure more stable.
Although the tai of this mineral has a lot of bones, it cannot roll around like a snake. Basically, it is like a stick," added Dr Woodruff.
With a solidly reinforced spine, it is very likely that Mamenchisaurus keeps its neck lying flat in a relatively shallow corner from the ground. However, because of its long neck, it can still pick leaves from the tops of the trees.
