An amphibian genus refers to a group of related amphibian species. Synonyms for amphibian genus include taxonomical categories such as family, order, and class. The family of an amphibian genus includes a group of related genera while the order refers to a group of related families. The class of an amphibian genus includes a group of related orders. Additionally, the scientific names of amphibian genera can also be considered as synonyms for the term. This includes the binomial nomenclature consisting of the genus name followed by the specific epithet, for example, Bufo americanus is a species within the genus Bufo.