“Jurassic mother from China.” That’s what scientists called Juramaia sinensis. This fossil is now housed here. It is an amazing find. It sheds light on the early evolution of mammals.
Juramaia sinensis, the Jurassic woody fossils, was discovered in Liaoning Province. That’s in northeast China. The discovery happened in 2009. This makes it approximately 160 million years old.
The Jurassic woody fossils discovery was made by Chinese and American scientists. They were from the Carnegie Museum of Natural History. Also involved were the Institute of Geology and the Beijing Museum of Natural History. The finding was published in Nature.
This Jurassic woody fossils discovery is important. It shows that mammals split much earlier. This happened around 160 million years ago during the Jurassic period. Scientists previously believed it was later. The age of the Juramaia sinensis fossil suggests faster evolution. It fills a gap in the fossil record. This relates to placental and marsupial divergence.
Juramaia sinensis was small. It weighed about 13 grams. It was an insect-eating mammal. The Juramaia woody fossils include a partial skull. Part of its skeleton was found too. It showed it could climb trees.
The origin of placental mammals like these Jurassic woody fossils matters. Most living mammals are placentals. A key event was when placentals diverged from marsupials.
Before this Jurassic woody fossils discovery, there was a puzzle. DNA evidence suggested eutherians existed around 160 million years ago. Yet, the oldest known eutherian, Eomaia, was 125 million years old. The Juramaia discovery supports the DNA findings. It establishes a new milestone in evolutionary history of Jurassic woody fossils.
Scientists believe Juramaia’s adaptations helped it survive. Its forelimbs were for climbing. Most Jurassic mammals lived on the ground. Climbing trees allowed eutherian mammals to find new resources. It let them exploit an untapped niche of Jurassic woody fossils.
The divergence of eutherian mammals from marsupials was important. It eventually led to placental birth. This type of reproduction is crucial for placental success. Early adaptation to trees paved their way. This makes the Jurassic woody fossils an evolutionary success. The Jurassic mother from China holds secrets to our past. It enriches our knowledge of mammal evolution.