Nitrosopumilus
Nitrosopumilus maritimus is an extremely common archaeon living in seawater. It is the first member of the Group 1a Nitrososphaerota to be isolated in pure culture. Wikipedia
Phylum: Nitrososphaerota
Class: Nitrososphaeria
Domain: Archaea
Family: Nitrosopumilaceae
Order: Nitrosopumilales
Genus: Nitrosopumilus; Qin et al. 2017