A team of researchers at Peking University, the First Institute of Oceanography and the University of Bristol has identified a well-preserved fossilized Markuelia hunanensis embryo of the Cambrian period. In their paper published in the journal Royal Society Open Science, the group describes the condition and attributes of the fossil, including muscle tissue and brain matter.
Click here for original story, Exceptionally well preserved fossilized worm embryo from the Cambrian period identified in China
Source: Phys.org