< 1911 Encyclopædia Britannica
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).
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