Gr. proto, first; Gr. masc. adj.archaîos, ancient; N.L. neut. pl. n.archaea, plural of archaeum; N.L. neut. pl. n.Protoarchaea, named Protoarchaea because bacteria have all retained the putatively ancestral archaebacterial phenotype of hyperthermophily, histones and sulphur reduction (not derived from the name of a genus)
homotypic synonym, validly published under the ICNP
Cavalier-Smith (2002) assigned this class to the superclass "Eurythermea" Cavalier-Smith 2002.Publication:
Cavalier-Smith T. The neomuran origin of archaebacteria, the negibacterial root of the universal tree and bacterial megaclassification. Int J Syst Evol Microbiol 2002; 52:7-76.
The type order of this class has been placed in the class Thermococci Zillig and Reysenbach 2002.Publication:
Zillig W, Reysenbach A-L. Class V Thermococci class. nov. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 1 (The Archaea and the Deeply Branching and Phototrophic Bacteria), Springer, New York, 2001, p. 341-348.
This taxon name is occasionally misprinted in some sources as: "Proteoarchaea".
This name was mentioned in a Request for an Opinion.Publication:
Goker M. Solving the remaining problems with names of classes. Request for an Opinion. Int J Syst Evol Microbiol 2022; 72:5605.
Rejected Name (Judicial Commission, Opinion 79 suppl.; IJSEM 64: 3599–3602).Publication:
Tindall BJ. Names at the rank of class, subclass and order, their typification and current status: Supplementary information to Opinion 79. Judicial Commission of the International Committee on Systematics of Prokaryotes. Int J Syst Evol Microbiol 2014; 64:3599-3602.
Irregularly formed name (not formed from the stem of the name of the nomenclatural type).Publication:
Euzeby JP. List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int J Syst Bacteriol 1997; 47:590-592.
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