Abstract
Because the name Bacillus pulvifaciens Katznelson 1950 was excluded from the Approved Lists of Bacterial Names, it has lost standing in bacteriological nomenclature. Based on deoxyribonucleic acid relatedness analyses, 24 weakly catalase-positive strains of “B. pulvifaciens” could be separated into two genotypically distinct groups. Because the larger group of 17 isolates included strains with high levels of deoxyribonucleic acid relatedness (80 to 100%) to a reference strain originally isolated and studied by Katznelson, this group was considered to represent the species as first described. This group was phenotypically homogeneous. Moreover, it was not genetically or phenotypically related to members of the smaller deoxyribonucleic acid relatedness group or to the type strains of Bacillus alvei, Bacillus larvae, and Bacillus laterosporus, species that are frequently associated with diseased honeybee larvae. Based on the results of this study, the revival of the name Bacillus pulvifaciens is proposed. The type strain is strain NRRL B-3685.
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