Question

Free swimming ciliated stage of liver fluke is known as

• A. Redia
• B. Miracidium
• C. Metacercaria
• D. Cercaria

Answer 1

The correct option is B Miracidium

Miracidium is the ciliated free-swimming oval elongated larvae of liver fluke.

Redia is the third larval stage of the liver fluke, it is nonciliated larvae with two lappets near posterior end and a birth pore at the anterior end.

Cercaria is the fourth larval stage produced by Redia larva in winters and is free swimming, tailed and nonciliated larva.

Encystation of cercaria larvae produces metacercaria which is, in fact, a nonciliated juvenile fluke.

Thus, the correct answer is option B.