are different and co-ordinate, their differentiae are themselves different in kind.
Gay  has stated that he found in the neighbourhood of Rio, shells of the marine genera
solen and mytilus, and fresh water ampullariae, living together in brackish water.
How do those groups of species, which constitute what are called distinct genera, and which differ from each other more than do the species of the same genus, arise?
As species of the same genus have usually, though by no means invariably, some similarity in habits and constitution, and always in structure, the struggle will generally be more severe between species of the same genus, when they come into competition with each other, than between species of distinct genera.
Using a database of marine fossils, Jablonski considered two types of groups of related organisms, or clades--in this case, genera
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In the last of Linnaeus' branchings, the so-called genera
split into the most basic identification of organisms, the species.
Species are thus very different from the other taxonomic categories used in virus classification such as genera
Think of all those kingdoms, phyla, classes, orders, families, genera
, and species that generations of biology students have groaned about memorizing.
In addition to the Micrococcus genus, bacteria belonging to the former genus Micrococcus were recently divided into the genera
Kocuria, Nesterenkonia, Kytococcus, and Dermacoccus, followed by rearrangement into two families (Micrococcaceae.
The M segment of nairoviruses is 30% to 50% larger than the M segments of members of other genera
in the Bunyavidae family and has a potential coding capacity of up to 240 kDa of protein (12).
Species of the two other closely related genera
grow only in Asia.