The prokaryotic generic names Yania Li et al. 2004 and Sinococcus Li et al. 2006 are illegitimate because they are later homonyms of the names Yania Roewer 1919 (Opiliones, Arachnida, Arthropoda, Animalia), Yania Huang 1997 (Lepidoptera: Hesperiidae) and Sinococcus Wu and Zheng 2000 (Homoptera: Coccomorpha) [Principle 2 of the Bacteriological Code (1990 Revision)]. Therefore, new generic names, Yaniella gen. nov. and Sinobaca gen. nov., are proposed for these taxa. In addition, a new family name, Yaniellaceae fam. nov., is proposed to accommodate Yaniella gen. nov. As a result, new combinations are required for the species to replace the illegitimate species names.