Ehrenberg (1833). "Dritter Beitrag zur Erkenntniss grosser Organisation in der Richtung des kleinsten Raumes" [Third contribution to [our] knowledge of greater organization in the direction of the smallest realm]. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin [Treatises of the Royal Academy of Sciences in Berlin] (in German): 145–336. From p. 281:"VOLVOCINA Nova Familia." (Volvocina New Family.) [Note: According to p. 145, Ehrenberg's paper was first presented in 1832, revised somewhat, and published in 1834.]