In southern China, discovered a series of spherical fossils difficult to explain, perhaps some of the world remains of early animals. A recent study found that these controversial fossil unlikely to be bacterial or unicellular protists.
This giant Lactococcus specimens have increased oval structure, also known as “matryoshka” for analogy Matryoshka.
According to foreign media reports, in southern China found it difficult to explain a series of spherical fossils, perhaps some of the world remains of early animals. A recent study found that these controversial fossil unlikely to be bacterial or unicellular protists. In the rock has been saved more than 600 million years cell, the study considered too complex and begin to differentiate. These fossils may be some multicellular algae, or ancient animal embryos.
Researchers suspect that these “matryoshka” may be the germ cells.
These fossils are considered strange giant Lactococcus (Megasphaera), is known from rocks in southern China Doushantuo (Doushantuo Formation) among. Virginia Polytechnic University (Virginia Tech) is to conduct research biologist 肖书海 first specimen of giant bacteria in 1998, and speculated that it may be animal embryos.
The place where these fossils worked shallow environment, the size of about 0.03 inches (0.7 mm) or so. Not yet discovered by the growth of these embryos from adult animal fossils. 肖书海 said before about the research giant bacteria of the genus is mainly extracted from the gray rock piece Doushantuo group. Now he and his team have successfully extracted more difficult to observe fossils from the black rock.
Ultrathin sections through the rocks, researchers were able to use the light to see where the structure look like a side of colored glass. They observed a plurality of cells, together with a spherical aggregate. Xiao Shuhai that these cells are in the shape and size different from each other, indicating that they have developed a different tissue types, may have different cellular functions. “It’s the bacteria and protists are unable to find, with the obvious complexity of multicellular organization.”
肖书海 that these fossils may represent a transition to single-celled organisms between multicellular organisms. However, they also found anatomical algae having the same structural form as is consistent, which means that the closer the fossil plants may. The findings on Wednesday published in “Nature” magazine