On the nomenclatural types of Methylothermus thermalis Tsubota et al. 2005, Methylothermus Tsubota et al. 2005 and Methylothermaceae Hirayama et al. 2014, their status under the International Code of Nomenclature of Prokaryotes and valid publication of the names Methylothermus gen. nov., Methylothermus subterraneus Hirayama et al. and Methylothermaceae Hirayama et al.

The nomenclatural type of Methylothermus thermalisTsubota et al. 2005 is based on MYHT=IPOD FERM P-19714=VKM B-2345. IPOD FERM P-19714 is a collection accession number issued solely for patent purposes and under Rule 30(4) cannot serve as the nomenclatural type of the species. Since the deposit of the type strain in at least two publicly accessible culture collections in different countries from which subcultures must be available after 1 January 2001 is a prerequisite of the valid publication of a name at the rank of species, the name Methylothermus thermalisTsubota et al. 2005 is not validly published. If the name Methylothermus thermalisTsubota et al. 2005 is not validly published it has no status under the Code and cannot serve as the nomenclatural type of the genus MethylothermusTsubota et al. 2005. Since it is a prerequisite of valid publication of a name that a nomenclatural type must be designated, the name MethylothermusTsubota et al. 2005 is not validly published. If the name MethylothermusTsubota et al. 2005 is not validly published, then the name at the rank of family MethylothermaceaeHirayama et al. 2014 is not based on a validly published name and it also has no type. Consequently, the name MethylothermaceaeHirayama et al. 2014 is not validly published.