A group of prokaryotes that generally live in sulfur-rich hot springs and generate energy by metabolizing sulfur. They are placed in the Crenarcheota of the Archaea (see Classification). Members of one subgroup, called eocytes, are thought to be immediate relatives of the first eukaryotes. Some eocyte genera are Acidianus, Desulfurococcus, Pyrodictium, Sulfolobus, and Thermodiscus.
Subjects: Genetics and Genomics.