Regarding organisms and their characteristics, which match is incorrect?

Hymenolepis nana, commonly known as the dwarf tapeworm, is characterized by its distinctive features that include an eggshell with a thick striated outer layer. However, referring to it as having a "striated shell" can be misleading in the context of its biological description, as the egg is more accurately described by its hexacanth embryo and the presence of polar filaments rather than simply focusing on striations. The term "striated shell" may suggest a broader or different structural characteristic than what is typically recognized in literature.

The other organisms listed have defining characteristics that are more accurately reflected in the descriptions provided. Chilomastix mesnili is known for its unique shepherd's crook or lemon shape due to the morphology of its trophozoites. Plasmodium malariae, a malaria-causing protozoan, is characterized by the 'band troph', which describes the appearance of its trophozoite stages within red blood cells. Wuchereria bancrofti, the causative agent of lymphatic filariasis, is recognized specifically for having sheathed microfilariae, providing an important identification feature in clinical diagnosis.