I have written this book because there is, as in almost all
supraspecific ciliate taxa, an ur- gent need for an up-to-date revision
of the oxytrichids, which are common in terrestrial, limnetic, and
marine biotopes. The last comprehensive, illustrated guides to this
group of hypotrichs were provided by KAHL (1932) and SmLER (1974b);
however, as regards syn- onymy and faunistics, these works are outdated
and not as detailed as EHRENBERG'S out- standing book from 1838. In
KAHL's revision, the oxytrichids sensu stricto are described on about 30
pages, whereas in the present book the systematic section comprises
about 830 pages. This extraordinary increase in page number is mainly
due to the following points: (i) Species number increased from about SO
in KAHL to about 170 in the present book. (ii) KAHL usually provided
only a single illustration of each species, whereas almost all published
illustrations on oxytrichid ciliates are included in my book. (iii)
Modern, phylogenetic systematics of oxytrichids without morphogenetic
data is impossible; conse- quentlY, -almost all detailed descriptions,
usually dealing with the type species, have been included. (iv) Synonymy
is discussed, and not only mentioned, as is unfortunately usual.