Fodinibacter isolates are aerobic heterotrophs. Cells are irregular short rods, occurring singly or in clusters. Utilise glucose, acetate, galactose, maltose, melibiose and pyruvate as sole carbon souces for growth in pure culture 1. Aesculin, gelatin, and Tweens 20, 40, and 80 are hydrolysed by the sole isolate in the genus Fodinibacter luteus. The genus Fodinibacter, according to the MiDAS classification, includes members of the genus Ornithinibacter. The sole species in the genus Onithinibacter aureus, is also an aerobic heterotroph, with irregular rod shaped morphology. Starch is hydrolysed and L-rhamnose, L-proline and glycine are utilised as carbon sources for growth 2. Nothing is known of the in situ physiology for either genus in activated sludge.
 Wang, Wang, Liu, Chen, Zhang, Wen, et al. - Fodinibacter luteus gen. nov., sp. nov., an actinobacterium isolated from a salt mine. - Int. J. Syst. Evol. Microbiol. 59(Pt 9): 2185-90. doi:10.1099/ijs.0.006882-0
 Xiao, Huang, Ye, Wu, Zhu, Zhan, et al. - Ornithinibacter aureus gen. nov., sp. nov., a novel member of the family Intrasporangiaceae. - Int. J. Syst. Evol. Microbiol. 61(Pt 3): 659-64. doi:10.1099/ijs.0.022806-0