Abstract
A description of how two basically dissimilar oral cytoarchitectures of ciliates, one prostomial the other ventrostomial, might have evolved is presented. The evolutionary sequence for these types of oral organization may well have been derived from within a karyorelictean ciliate ancestry. A truly gymnostomatous condition, similar to the morphology of oral areas in extantTracheloraphis species, is postulated to have preceded the evolution of oral types in which kinetids have come to support the ingestatory areas. The precursor to theTracheloraphis stage is argued to have been similar to the flan-like condition of the extant ciliate genusKentrophoros. Thus, it is proposed that ciliate oral architecture had its origin from within the group of karyorelictean ciliates rather than from some flagellate ancestor.
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Small, E.B. An essay on the evolution of ciliophoran oral cytoarchitecture based on descent from within a karyorelictean ancestry. Origins Life Evol Biosphere 13, 217–228 (1984). https://doi.org/10.1007/BF00927173
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DOI: https://doi.org/10.1007/BF00927173