The low form elements devoid of a nucleus were in 1866 by Hæckel (Generelle Morphologie der Organismen 1866, vol. 1, p. 270) called cytodes (cell like) to distinguish them from cytes or cells.
1874 August, Louis Elsberg, «Regeneration, or the Preservation of Organic Molecules: A Contribution to the Doctrine of Evolution» in Proceedings of the American Association for the Advancement of Science: Twenty-third meeting, held at Hartford, Conn., August, 1874, ed. Frederic Ward Putnam (1875), part II, § B: “Natural History”, field iv: ‘Zoology’, page 90, footnote 1