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Thirteen strains of motile arthrospore-bearing actinomycetes were isolated from soils in Japan, India, and Nepal. These organisms underwent differentiation into aerial and substrate mycelia in their growth cycles and produced motile spores arranged in chains on their aerial mycelia. Sporangia were not observed. The cell walls contained L-lysine, serine, glycine, D-glutamic acid, and D-alanine (cell wall type VI). Mycolic acids were absent; the major menaquinones were MK-9(H8) and MK-10(H8); the phospholipid type was type PIII. The taxonomic characteristics of these isolates are different from those of the previously described motile actinomycetes. The name Catenuloplanes japonicus gen. nov., sp. nov., nom. rev. is proposed for these organisms. The type strain is strain N381-16, which has been deposited in the Institute for Fermentation, Osaka as strain IFO 14176 and in the American Type Culture Collection as strain ATCC 31637.
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