The putatively asexual Colpodean ciliates potentially pose a problem to macro-organismic theories of evolution.
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Small to medium-sized ciliates, with an unchanging form.
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The transport of ciliates through the columns was monitored at the same time that predation was monitored.
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Medium-sized ciliates of general bell-like form.
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Both the expansion of the excystment vacuole and the emergence of ciliates occurred even when the cysts were immersed in hypertonic medium.
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The challenge that colpodean ciliates pose is therefore not to evolutionary theory, but to our ability to induce microbial eukaryotic sex in the laboratory.
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It is one of the commonest and most widely spread ciliates known, although at Woods Hole I was surprised to see it so rarely.
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Heterotrichous ciliates play an important role in aquatic ecosystem energy flow processes and many are model organisms for research in cytology, regenerative biology, and toxicology.
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Here we show using de novo genome sequencing, that colpodean ciliates have the meiotic genes required for sex and these genes are under functional constraint.
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If macro-organismic theories of evolution also broadly apply to microbial eukaryotes, though, then most or all of the colpodean ciliates should merely be secretively sexual.
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Some (the Flagellates) have one or two stout oars; some (the Ciliates) have numbers of fine hairs (or cilia).
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Retardation of ciliate transport was greater in columns containing attached bacteria than in bacterium-free columns.
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E. CILIARIS.- Aprettynative species, with ciliate glandular leaves, and racemes of highly-coloured ,rosyflowers.
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It was this form, I believe, that Peck '95 described as a "ciliate."