The tequment of Fasciola gigantica was composed of surface non-nucleated layer (syncytium) connected to deep tegument cells by tubular extensions. The tegumental cells were two types, dark cells and light cells. The dark cell was characterized by numerous mitochondria and dense membrane bounded secretory granules, while the light cell was characterized by few mitochondria and flattened membrane-bounded secretory bodies. The surface syncytium showed both types of secretory bodies.