Thaumarchaeota is a type of archaea microorganism that is often found in marine environments. This group of organisms is known for its ability to produce ammonia, which plays an essential role in the nitrogen cycle. While "thaumarchaeota" is a specific term used to describe these microorganisms, there are several synonyms that can be used in its place. Some of these synonyms include marine crenarchaeotic group I, marine group I, archaeal marine group I, and Nitrosopumilales. These terms are interchangeable and can often be used to refer to the same group of organisms. Regardless of which term is used, these microorganisms play an important role in regulating the nitrogen cycle in the ocean.