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The Black Moon Clan (ブラックムーン一族, Burakku Mūn Ichizoku?, lit. "Black Moon Family") is a fictional clan existing in the 30th century in the Sailor Moon metaseries. It comprises the antagonists of the second major story arc, which is called Black Moon in the manga and which fills the majority of the Sailor Moon R anime. In the dubbed anime they are called the Negamoon Family.

Members of the Black Moon Clan come from Planet Nemesis, a fictional tenth planet of the Solar System. It is described as a planet of "negative energy," having the ability to vanish from sight, but remained traceable by X-Rays. All members of the Black Moon Clan have black, upside-down crescents on their foreheads (the inverse of the marking of the Silver Millennium). They wear earrings which, according to the Materials Collection, are made of Black Crystal and allow them to teleport.

Source: Wikipedia