Abstract
An.ca' lo.mi.cro' bi.um. Gr. masc. n. ancalos arm; Gr. adj. micros small; Gr. masc. n. bios life; M.L. neut. n. Ancalomicrobium arm (-producing) microorganism.
Proteobacteria / Alphaproteobacteria / Rhizobiales / Hyphomicrobiaceae / Ancalomicrobium
Unicellular bacterium with conical cells ~1.0 µm in diameter. Two to eight or more prosthecae produced per cell. Prosthecae are cylindrical without crossbands and taper gradually from cell to a distal diameter of ~0.2 µm and a length of 2–5 µm when fully differentiated. Prosthecae may be bifurcated. Budding bacterium. Buds are formed directly from mother cell, never from prosthecae. Cells occur singly or in pairs prior to division; rarely form aggregates.
Type genus: Ancalomicrobium adetum Staley 1968, 1940.