Formation of names of genera of prokaryotes that end on -oides or -opsis. A proposal for addenda to Rule 65(2) and Appendix 9 of the International Code of Nomenclature of Prokaryotes Oren, Aharon and Schink, Bernhard,, 66, 2452-2453 (2016), doi = https://doi.org/10.1099/ijsem.0.001031, publicationName = Microbiology Society, issn = 1466-5026, abstract= In view of the current confusion about the correct gender of genus names ending on –oides, and possible confusion in the future for genus names ending on –opsis, we propose non-retroactive addenda to Rule 65(2) and Appendix 9 of the International Code of Nomenclature of Prokaryotes so that new genera to be formed by adding the ending –oides to the stem of an existing genus name or another (Neo-) Latin word must be treated as neuter and genus names ending on –opsis are to be treated as feminine., language=, type=