The experimental development of Ophiotaenia monnigi Fuhrmann, 1924 in Cyclops leuckarti.

Cyclops leuckarti and C. prasinus can serve as the intermediate hosts of Ophiotaenia monnigi, Fuhrmann, 1924. From the hexacanth, the parasite developed to a mature procercoid larva without a cercomere, although it appeared in the development processes. At the two-part development stage, all the hooks transferred to the cercomere, and it dropped off in the latest time of the larval developing. In the development, a coelom presented in the front part as well as in the cercomere. An apical appeared, and two pairs of gland cells were found after the sucker. The whole developmental course took more than 11 days, and it was even longer in the host, C. prasinus, in which the parasite larva developed slower.