The legitimacy, spelling and grammatical gender of names of classes validly published under the International Code of Nomenclature of Prokaryotes (ICNP) is reviewed in the aftermath of the decision to make Rule 8 of the ICNP non-retroactive regarding the formation of such names. This ruling removed most of the nomenclatural uncertainty that affected names of classes but some issues remain to be solved. Some previously legitimate names of classes became illegitimate by this decision while others retained their illegitimacy. The Judicial Commission is asked to conduct according clarifications. It is proposed to place the names at the rank of classAnoxyphotobacteria (Gibbons and Murray 1978) Murray 1988,Archaeobacteria Murray 1988,Bacteria Haeckel 1894 (Approved Lists 1980),Firmibacteria Murray 1988,Microtatobiotes Philip 1956 (Approved Lists 1980),Oxyphotobacteria (ex Gibbons and Murray 1978) Murray 1988,Photobacteria Gibbons and Murray 1978 (Approved Lists 1980),Proteobacteria Stackebrandtet al. 1988,Schizomycetes Nägeli 1857 (Approved Lists 1980) andScotobacteria Gibbons and Murray 1978 (Approved Lists 1980) on the list of rejected names. It is also requested to orthographically correct the namesAquificae Reysenbach 2002,Chrysiogenetes Garrity and Holt 2002,Gemmatimonadetes Zhanget al. 2003,Opitutae Chooet al. 2007 andVerrucomicrobiae Hedlundet al. 1998.