The creatures in the book *The Martian* by Andy Weir are not specifically named. They are described as single-celled organisms that have been found in the Martian soil. These organisms are hypothesized to be the source of a mysterious signal that the main character, Mark Watney, detects.

It's important to note that these creatures are not confirmed to exist, as the book is a work of fiction. However, they are a fascinating element of the story that raises interesting questions about the possibility of life on Mars.