According to Yarza et al. (2013), an "un-sequenced orphan species where descriptions, illustrations or dead preserved material serve as the type.".Publication:
Yarza P, Sproer C, Swiderski J, Mrotzek N, Spring S, Tindall BJ, Gronow S, Pukall R, Klenk HP, Lang E, et al. Sequencing orphan species initiative (SOS): Filling the gaps in the 16S rRNA gene sequence database for all species with validly published names. Syst Appl Microbiol 2013; 36:69-73.
Revision of the former classification as "CandidatusMycoplasma wenyonii".Publication:
Neimark H, Johansson KE, Rikihisa Y, Tully JG. Proposal to transfer some members of the genera Haemobartonella and Eperythrozoon to the genus Mycoplasma with descriptions of 'CandidatusMycoplasma haemofelis', 'CandidatusMycoplasma haemomuris', 'CandidatusMycoplasma haemosuis' and 'CandidatusMycoplasma wenyonii'. Int J Syst Evol Microbiol 2001; 51:891-899.
In 2001, Neimark et al. proposed the transfer of Eperythrozoon wenyonii to the genus Mycoplasma with the Candidatus status, "CandidatusMycoplasma wenyonii" Neimark et al. 2001. The Candidatus designation is for new, incompletely described taxa, in order to give them a provisional status; changing validly published names to Candidatus would lose their standing in nomenclature. So, Neimark et al. revise "CandidatusMycoplasma wenyonii" to Mycoplasma wenyonii comb. nov.Publication:
Adler S, Ellenbogen V. A note on two new blood parasites of cattle, Eperythrozoon and Bartonella. Journal of Comparative Pathology 1934; 47:220-221.
The full TRBA 466 classification is: risk group = 2, note = "t".