Aquaspirillum anulus (Williams & Rittenberg, 1957) Hylemon et al., 1973 Dataset Prokaryotic Nomenclature Up-to-Date (PNU) Rank SPECIES Published in Int. J. Syst. Bacteriol. 30::250 Classification genus Giesbergeria species Giesbergeria anulus Name Homonyms Aquaspirillum anulus (Williams & Rittenberg, 1957) Hylemon et al., 1973