Which parasite is known for its "leaf-shaped" morphology?

Fasciola hepatica, commonly known as the liver fluke, is recognized for its distinct "leaf-shaped" morphology. This flat, leaf-like appearance is characteristic of many trematodes, particularly those within the Fasciola genus. The shape allows Fasciola hepatica to navigate through its host's tissues and adhere to bile ducts, where it resides and contributes to pathologies related to biliary obstruction and liver damage.

In contrast, Schistosoma mansoni is a blood fluke and has a more elongated and oval shape suitable for inhabiting blood vessels. Taenia saginata, a tapeworm, has a flat and segmented body but does not have the leaf-like shape of Fasciola. Lastly, Enterobius vermicularis, the pinworm, is small and cylindrical in shape, which is not consistent with the leaf morphology seen in Fasciola hepatica. Thus, the distinct leaf-like structure of Fasciola hepatica clearly identifies it as the correct answer to this question.