1911 Encyclopædia Britannica/Heterokaryota
Appearance
HETEROKARYOTA, a zoological name proposed by S. J. Hickson for the Infusoria (q.v.) on the ground of the differentiation of their nuclear apparatus into meganucleus and micronucleus (or nuclei).
See Lankester’s Treatise of Zoology, vol. i. fasc. 1 (1903).