Epithelial cells are essential and abundant in all multicellular animals where their dynamic cell shape changes orchestrate morphogenesis of the embryo and individual organs. Genetic analysis in the simple nematode Caenorhabditiselegans provides some clues to the mechanisms that are involved in specifying epithelial cell fates and in controlling specific epithelial processes such as junction assembly, trafficking or cell fusion and cell adhesion. Here we review recent findings concerning C.elegans epithelial cells, focusing in particular on epithelial polarity, and transcriptional control.