O nei faʻavasegaina faʻalagolago tele i le faʻaaogaina o le faʻasologa o ribosomal RNA genes e faʻaalia ai sootaga i le va o meaola (molecular phylogenetics). O le tele o ituaiga o archaea o tagata o le lua autu phyla, le Euryarchaeota ma le Crenarchaeota. O isi vaega na faʻatulagaina faʻatulagaina. Mo se faʻataʻitaʻiga, o le ituaiga Nanoarchaeum equitans, lea na maua i le 2003, ua tuʻuina atu i lona lava phylum, le Nanoarchaeota. O se fou faʻavasegaina faiga ua fuafuaina foi e faʻatulaga archaea i vaega o meaola e fefaʻasoaaʻi fausaga foliga ma tupulaga masani. O nei faʻavasegaina faʻavaeina faʻalagolago tele i le faʻaaogaina o le faʻasologa o ribosomal RNA genes e faʻaalia ai sootaga i le va o meaola (molecular phylogenetics). O nisi o ituaiga o archaea o sui o lua autu phyla
Euryarchaeota ma Crenarchaeota