Every universal except for the most general of genera, can be said to be "composed" out of a genus and a differentia.
Among passerines Zosterops is the most diverse of genera, with about 80 described species found in Africa, Australasia, and the South Pacific islands.
Searched viruses included JEV, dengue viruses 1 4, West Nile virus, chikungunya virus, herpes simplex viruses 1 and 2, varicella-zoster virus, Rift Valley fever virus, Crimean-Congo hemorrhagic fever virus, and most viruses of genera Enterovirus and Alphavirus.
Most of the genera are native to the Southwest.
Each of the Cambrian biomere events eliminated several trilobite families, which collectively contained most of the genera and species that were living on the continental shelves.
However, in the tropical refuge of sub-Saharan Africa, although some mammals went extinct (e.g., giant forms of buffalo and hartebeest), most of the genera and species that evolved during the golden age of mammals survived to the present.
Most of the genera identified in the granules after one year operation of the anoxic USB reactor were denitrifying bacteria able to use nitrite and nitrate as electron acceptors and aromatic compounds as electron donors.
With the exception of the myxobacteria and Bdellovibrio most of the genera, including Anaeromyxobacter, Desulfotalea, Desulfovibrio, Geobacter, Lawsonia, Pelobacter, and Syntrophus are anaerobic (use terminal electron acceptors other than O2).
The phylogenetic positions of most of these genera have recently been clarified.
The monophyly of most of the genera and families, however, has not been tested.
