What two features of Dugesia distinguish its anterior end from its posterior end?

Dugesia, a genus of freshwater planarians, can be distinguished at its anterior end by the presence of eye spots (ocelli), which detect light, and a protruding structure called the pharynx, used for feeding. In contrast, the posterior end is generally more tapered and lacks these sensory and feeding features. Additionally, the anterior end is typically broader and more rounded compared to the narrower, pointed posterior end.