How does the shape of the digestive sac of opithorchis compare with that of dugesia?

The digestive sac of Opisthorchis, a genus of trematodes (flukes), is typically more complex and branched compared to that of Dugesia, a genus of freshwater planarians. Opisthorchis has a more developed and specialized digestive system suited for its parasitic lifestyle, featuring a bifurcated intestine that enhances nutrient absorption from its host. In contrast, Dugesia has a simpler, less branched gastrovascular cavity that reflects its free-living, predatory nature. Overall, the structural differences reflect their distinct modes of life and feeding strategies.