Ciliates are unicellular organisms characterized by the presence of ci
lia (at least in the juvenile stage), an oral cavity, nuclear dualism,
conjugation, equatorial division plane in binary fission, and alveola
r pellicular organization. Ciliates play an important role in the gene
ral economy of marine, fresh-water and soil enviroments, being essenti
al links in the food chain. This article reviews the different feeding
behaviours present in these protista together with the related digest
ive processes. (C) 1997 Elsevier Science Ltd. All rights reserved.