Diana L Lipscomb

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A benthic marine protist (Stephanopogon) with a homokaryotic nucleus has long been considered to be a gymnostome ciliate. It has been important in hypotheses concerning the origin of ciliates, the evolution and origin of the dual nuclear apparatus of contemporary species of the Ciliophora, and the origin of the multicellular Eumetazoa. Ultrastructural(More)
The Synhymeniida is characterized both by a band of somatic dikinetids, the synhymenium, extending across the surface of the cell and by a ventral cell mouth lacking specialized feeding cilia but subtended by a well-developed cyrtos. The synhymeniids have been hypothesized to be members of the class Nassophorea but our previous ultrastructural study of the(More)
The first ultrastructural description of the genus Placus is presented. Each somatic kinetosome has a cone-shaped axosomal plate, nonoverlapping postciliary microtubules, an anteriorly directed kinetodesmal fiber, and a radial ribbon of transverse microtubules, which extend laterally under the ciliary furrow and insert in the cortical ridge. A closed ring(More)
Spathidiopsis and Placus are the only two genera within the family Placidae. The family has been placed in the class Prostomatea and order Prorodontida because its members have somatic monokinetids with a radial transverse ribbon, a straight non-overlapping postciliary ribbon, and anteriorly directed non-overlapping kinetodesmal fibril, an apical cytostome(More)
Recent advances in molecular technology have revolutionized research on all aspects of the biology of organisms, including ciliates, and created unprecedented opportunities for pursuing a more integrative approach to investigations of biodiversity. However, this goal is complicated by large gaps and inconsistencies that still exist in the foundation of(More)
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