Intramacronucleata is a subphylum of ciliates. The group is characterized by the manner in which division of the macronucleus is accomplished during binary fission of the cell. In ciliates of this subphylum, division of the macronucleus is achieved by the action of microtubules which are assembled inside the macronucleus itself. This is in contrast to heterotrich ciliates of the subphylum Postciliodesmatophora, in which division of the macronucleus relies on microtubules formed outside the macronuclear envelope.

"Oxytricha trifallax"
Oxytricha trifallax
Scientific classification e
Clade: SAR
Infrakingdom: Alveolata
Phylum: Ciliophora
Subphylum: Intramacronucleata
Lynn, 1996[1]


  1. ^ Lynn, Denis (2008). "9. Subphylum 2. Intramacronucleata: class 3. Litostomatea. Simple ciliates but highly derived". The Ciliated Protozoa: Characterization, Classification, and Guide to the Literature. Springer. pp. 206–. ISBN 978-1-4020-8239-9.

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