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In a simple genus, containing only two species, it was easy to tell them apart with a one-word genus and a one-word specific name; but as more species were discovered, the names necessarily became longer and unwieldy, for instance, Plantago foliis ovato-lanceolatus pubescentibus, spica cylindrica, scapo tereti ("plantain with pubescent ovate ...
An interpolated name is italicized and placed in non-italic parentheses (round brackets); some examples are after a genus name to indicate a subgenus, after a genus group to denote an aggregate of species, after a species name to mean an aggregate of subspecies, after a genus and the word "section" or "sect." to provide a botanical genus ...
Designation and fixation have different meanings. A designation is the proposal of the type species. It is not necessary to have spelled the name of the genus or species correctly with correct authors (articles 67.2.1, 67.6, 67.7), type species are always the correctly spelled name. If the designation is valid, the type species is fixed.
The name sardine is used for many different species of small, oily fishes; the appropriate things to do are to write an article describing the attributes the species have in common under that name, and create separate articles for each genus. However, when there is a clear core meaning for the common name, with other meanings by analogy, then ...
The rules and regulations governing the giving of a new species name are explained in the article species description. For example, the scientific name for humans is Homo sapiens, which is the species name, consisting of two names: Homo is the "generic name" (the name of the genus) and sapiens is the "specific name".
A family or order with a single genus is treated at the article for that genus. A genus with a single species is treated at the article for the genus. (See Template:Speciesbox#Monospecific genera for the taxobox for monotypic genera at the genus name.) An order with a single family is treated at the article for that family.
A taxon is usually assigned a rank when it is given its formal name. The basic ranks are species and genus. When an organism is given a species name it is assigned to a genus, and the genus name is part of the species name. The species name is also called a binomial, that is, a two-term name.
The main ranks are kingdom (regnum), phylum or division (divisio), class (classis), order (ordo), family (familia), genus and species. The ranks of section and series are also used in botany for groups within genera, while section is used in zoology for a division of an order.