Possible ancestor of sponges found
Exquisite details of 600-million-year old fossil similar to cell structure seen in today’s marine animals
![sponge fossil](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/sm_sponge_free.jpg?fit=860%2C460&ssl=1)
TINY BUT EXQUISITE A scanning electron micrograph of a fossil just 1.2 millimeters wide, found in southern China, has a shape and some details that look like sponges.
Image courtesy of Zongjun Yin.