The cluster consists of six pathogenic mycoplasmas causing disease in ruminants, which share many genotypic and phenotypic traits. The cluster comprises five recognized taxa: subsp. Small Colony (MmmSC), subsp. Large Colony (MmmLC), subsp. (Mmc), subsp. (Mcc) and subsp. (Mccp). The group of strains known as sp. bovine group 7 of Leach (MBG7) has remained unassigned, due to conflicting data obtained by different classification methods. In the present paper, all available data, including recent phylogenetic analyses, have been reviewed, resulting in a proposal for an emended taxonomy of this cluster: (i) the MBG7 strains, although related phylogenetically to , hold sufficient characteristic traits to be assigned as a separate species, i.e. sp. nov. (type strain, PG50 = N29 = NCTC 10133 = DSM 21131); (ii) MmmLC and Mmc, which can only be distinguished by serological methods and are related more distantly to MmmSC, should be combined into a single subspecies, i.e. subsp. , leaving subsp. (MmmSC) as the exclusive designation for the agent of contagious bovine pleuropneumonia. A taxonomic description of sp. nov. and emended descriptions of subsp. and subsp. are presented. As a result of these emendments, the cluster will hereafter be composed of five taxa comprising three subclusters, which correspond to the subspecies, the subspecies and the novel species .


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