Paleontologists have discovered the oldest known and scientifically documented “belly belly” of a dinosaur in China, where the clay layers were preserved on the belly of the dinosaur, which is about 125 million years old.
Scientists monitored what was considered the first navel ever discovered on a non-flying dinosaur, in a 125-million-year-old fossil of a two-legged dinosaur in China, according to live science magazine. Cretaceous, 145 million to 66 million years ago, and scientists discovered the long and thin trace of the umbilical scar when they exposed the fossil to a focused beam of laser light.
The scar or belly button appears in the form of a slight imbalance in the skin pattern and scales over the belly of the dinosaur, which is approximately equivalent to that found in the abdomen of mammals, with the love of a study published in the journal “BMC Biology”.
Unlike mammals, which obtain nutrients during their embryonic period from the placenta, embryos of birds and reptiles are fed with a yolk sac attached to their abdomen through various blood vessels, and when these embryos hatch.
The yolk sac is completely absorbed into the body, leaving a linear abdominal scar that usually heals within a few days or weeks, but in some reptiles, such as crocodiles, the umbilical scar can last beyond sexual maturity, and this fossilized discovery of the umbilicus is the first An indication that dinosaurs may have had navel scars that did not completely disappear.
Oldest preserved umbilical scar reveals #dinosaurs had ‘belly buttons’.
Read it here: https://t.co/PmABhzBxvA pic.twitter.com/6RLPrSbY6b
— BMC Biology (@BMCBiology) June 18, 2022