Drawing by P. T. Cleve (Plate 7, fig.1 from Cleve, P.T. 1900. Notes on some Atlantic Plankton-Organisms. Kong. Svenska Vetenskaps-Akademiens Handlingar 34:1-22). He described Ceratium ranipes as a "rare and remarkable form". The size bar is based on the text description of an organism on the following plate as 50 micron long.