The spathidiids belong to the ciliate subclass Haptoria (Protozoa, Ciliophora), that is, they are predators using toxicysts to overwhelm the prey.

Over 200 nominal spathidiid species have been described, sometimes based on seemingly minute differences. Thus, many protozoologists considered them as indeterminable and claimed for a detailed revision. The present monograph carefully revises the taxonomy, nomenclature, and ecology of all nominal species and shows that spathidiid diversity has been greatly underestimated. Based on the reinvestigation of described species with modern methods (silver impregnation, scanning electron microscopy) and the first description of over 50 new species, the family Spathidiidae is split into four families and 20 genera. Each species is described and figured in detail, making it unnecessary to go back to the original literature often difficult to obtain. Two identification keys are provided, viz., one for taxonomists and another, simple key for users not specifically trained in ciliate taxonomy.

The Spathidiidae are a very "difficult" group of freshwater and soil ciliates The last revision dates back to KAHL in 1931 Now, about 200 species have been described in widely scattered journals, and thus most species are indeterminable for routine workers The monograph critically puts together all information and describes each species in detail, including 50 new taxa found world-wide Description includes modern electron microscopical data

Autorentext

Prof. W. Foissner is Professor (Extraordinarius) of Zoology at Salzburg University. Since 1996 he has been President of German Society of Protozoologists. He has on his name over 500 publications, including about 300 peer-reviewed papers and 8 books (with together over 5000 pages), in international and national scientific journals, most about ciliates, but some on flagellates, naked and testate amoebae, and sporozoans. He is an invited speaker at many meetings. His main interests are Taxonomy, phylogeny, evolution, ecology and biodiversity of freshwater and soil protozoa, mainly ciliates and testate amoebae.

Inhalt
General Section.- Systematic Section.- Family Protospathidiidae nov. gam..- Family Arcuospathidiidae nov. fam..- Family Apertospathulidea FOISSNER, XU & KREUTZ, 2005.