![](http://www.ecns.cn/hd/2020/01/16/caac94764b024f6bb75f58a5761db862.jpg)
A scanning electron microscopy image of the single-celled organism Prometheoarchaeum syntrophicum strain MK-D1 showing the cell with tentacle-like branching protrusions is seen in this image released at the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) in Yokosuka, Japan on January 15, 2020. (Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/16/85114438bfcc4417a6e3a4d2a7cbf017.jpg)
A scanning electron microscopy image of the single-celled organism Prometheoarchaeum syntrophicum strain MK-D1 showing the cell with tentacle-like branching protrusions is seen in this image released at the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) in Yokosuka, Japan on January 15, 2020. (Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/16/a2b297684b4943c68b2cd95f7ce08c5b.jpg)
A scanning electron microscopy image of the single-celled organism Prometheoarchaeum syntrophicum strain MK-D1 showing the cell with tentacle-like branching protrusions is seen in this image released at the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) in Yokosuka, Japan on January 15, 2020. (Photo/Agencies)