The nomenclature of butterflies refers to the system of names and classification used to identify and describe different species of butterflies. Like all organisms, butterflies are classified based on their shared characteristics, such as physical traits, behavior, and genetics. The classification of butterflies follows a hierarchy, with each level representing a group of organisms that is more inclusive than the one below it.

At the highest level, butterflies are classified as part of the class Insecta, which includes all insects. Within the class Insecta, butterflies are further classified as part of the order Lepidoptera, which includes all moths and butterflies. The order Lepidoptera is divided into two suborders: the Glossata, which includes most butterflies, and the Heteroneura, which includes most moths.

Within the suborder Glossata, butterflies are further divided into several families, each of which contains a group of related species. Some of the major families of butterflies include the Nymphalidae (brush-footed butterflies), the Papilionidae (swallowtails and parnassians), and the Pieridae (whites and yellows).

Each species of butterfly is given a scientific name that consists of two parts: the genus and the species. The genus is the larger group to which the species belongs, and the species is the specific type of butterfly within that group. For example, the scientific name of the Monarch butterfly is Danaus plexippus, where Danaus is the genus and plexippus is the species. The scientific names of butterflies are typically written in italics, and the genus is always capitalized while the species is not.

The nomenclature of butterflies is governed by the International Code of Zoological Nomenclature (ICZN), which is a set of rules that defines how scientific names are created, used, and maintained. The ICZN is used to ensure that there is a consistent and standardized system for naming and classifying all organisms, including butterflies.

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