[5] The monophyly of Nanobdellati is not yet considered established, due to the high mutation rate of the included phyla, which can lead to the artifact of the long branch attraction (LBA) where the lineages are grouped basally or artificially at the base of the phylogenetic tree without being related.

[6][7][8] The Nanobdellati groups together different phyla with a variety of environmental distribution and metabolism, ranging from symbiotic and thermophilic forms such as Nanoarchaeota, acidophiles like Parvarchaeota and non-extremophiles like Aenigmarchaeota and Diapherotrites.

[4][21][22] Bacteria Altarchaeota Diapherotrites Micrarchaeota Undinarchaeota Aenigmatarchaeota Nanohaloarchaeota Nanoarchaeota Parvarchaeota Mamarchaeota Pacearchaeota Woesearchaeota Euryarchaeota

Bacteria Thermococci Hadesarchaea Methanobacteria Methanopyri Methanococci Thermoplasmata Archaeoglobi Methanomicrobia "Nanohaloarchaeota" Haloarchaea "Altarchaeota" Diapherotrites Micrarchaeota Undinarchaeota Aenigmatarchaeota Nanoarchaeota Parvarchaeota Mamarchaeota Pacearchaeota Woesearchaeota

Lokiarchaeota Odinarchaeota Thorarchaeota Heimdallarchaeota Eukaryota The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[24] and National Center for Biotechnology Information (NCBI).

"Parvarchaeales" "Pacearchaeales" "Woesearchaeales" Nanobdellales "Altarchaeales" "Forterreales" "Iainarchaeales" "Norongarragalinales" "Micrarchaeales" "Anstonellales" "Gugararchaeales" "Burarchaeales" "Fermentimicrarchaeales" "Hadarchaeota" Methanobacteriota_B "Hydrothermarchaeota" "Methanobacteriota" "Thermoplasmatota" "Halobacteriota" "Asgardaeota" Thermoproteota Kingdom Nanobdellati Rinke et al. 2013