species — English
fundamental unit of classification in the classification of living organisms; consists of populations of related individuals that resemble one another, that are able to breed among themselves, but are not able to breed with members of another species. Populations within a species that show recognisable, inherited differences but are capable of interbreeding freely are called subspecies, races, or varieties. The specific epithet is written second, is always underlined or italicised and the first letter of the specific epithet name is never capitalised.