For the first time, scientists discovered the Itachi family animal fossils with osteosome fibroma

(Reporter Zhang Lei, Zhang Xiaohua) China University of Geosciences (Beijing) Xing Lida's research team found a small Itachi family in Linxia Basin, Gansu -Deputy America's cranial bone. It is determined to be osteoma fibroma, which is the first Itachi family that has been scientifically recorded. The joint team of Sino -foreign scientists has studied and analyzed fossil specimens and obtained a new achievement of ancient pathological science. Related papers have recently published in paleontological journals "History Biology".

The deputy America is a genus of the family of breastfeeding. The back edge of the skull fossils discovered this time is broken, and the other parts are basically complete. The total length is 8.9 cm. It is an adult individual. The skull is straight above the skull, and the sagittament of the bite muscle attached to the top of the head is very low, indicating that its bite force is poor. Based on these characteristics, the earliest German paleontologist Donski, the first named German biologist, speculates that it uses fish as the main food source.

During the fossil repair process, Liu Jian, the curator of the Sichuan top museum, discovered the abnormality of the jaw. After further refinement, it was found that the posterior teeth on both sides of the fossil specimen were obviously abnormally increased. The hyperplasia of the left side was not swollen, and the right side was significantly swollen to form a lump. The lesion causes the left tooth to break and fall off, the right rear tooth falls off, and the tooth socket is closed. Micro-CT scan (Micro-CT) results show that the outer edge of the hyperplasia tissue is light and bright, and the distinction between normal bone is obvious; the interior of the hyperplasia shows the density difference, there are dark gray irregular spots, and the color is the same as the outside of the proliferation tissue. The light bands surrounding irregular spots represent high -density tissues.

Compared with the diagnosis of modern medicine, the researchers have found that the surface of hyperplasia is consistent with the manifestation of osteosted fibroma.

"After further CT image comparison, we diagnosed the beast as a teena tumor -like osteosoma. This kind of disease is not obvious, but it has a greater effect on the teeth. The lesions have not affected the beast. The main food of 且 is relatively soft and easy to digest — obviously, fish is a food that meets these requirements. "In the opinion of the first author of the dissertation, Wang Dong Hao, a doctoral student of China University of Geosciences (Beijing) It is speculated that evidence is provided, and it also provides a new perspective for the study of ossification fibroma.

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