Thirty-three strains previously classified into 11 species in the bacterial family were subjected to phylogenetic analysis based on 16S rRNA sequences. The family formed a distinct clade consisting of four phylogenetic groups as judged from branch lengths, bootstrap values and signature nucleotides. Group I contained the classical moraxellae and strains of the coccal moraxellae, previously known as , with 16S rRNA similarity of ≥95%. A further division of group I into five tentative clusters is discussed. Group II consisted of two strains representing and . These strains were only distantly related to each other (93·4%) and also to the other members of the (≤93%). Therefore, reasons for reclassification of these species into separate and new genera are discussed. Group III harboured strains of the genus and strain 752/52 of . This strain of formed an early branch from the group III line of descent. Interestingly, a distant relationship was found between strain ATCC 23333 (formerly classified as ) and strain 752/52, exhibiting less than 96% nucleotide similarity between their 16S rRNA sequences. The establishment of a new genus for strain 752/52 is therefore suggested. Group IV contained only two strains of the genus . Strategies for the development of diagnostic probes and distinctive sequences for 16S rRNA-based species-specific assays within group I are suggested. Although these findings add to the classificatory placements within the , analysis of a more comprehensive selection of strains is still needed to obtain a complete classification system within this family.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error