a species name might later be used as a subspecies name).
Each family group name has a type genus, each genus group name has a type species, and each species group name has a type specimen or type series.
In the late 19th century specimens were often labelled as types merely because they were typical of the species.
The genus name is always included with the species name to form the binomial.
The subgenus to which it belongs (if there is one) can be included in brackets after the genus name and before the species name but inclusion of this name is not essential.
Notice that the author of the name can be included at the end of the name.
Linnaeus published the 10th edition of the Systema Naturae and in it consistently used his system of binomial nomenclature.
This system was adopted by other naturalists but with no rules governing it so that by the middle of the 19th century there was confusion.