[Morphology and development of the cysticercoids of Paricterotaenia porosa (Cestoda: Dilepididae)].

Studies of the development of Paricterotaenia porosa in its intermediate host Chironomus sp. were carried out. At 20 degrees C the development of the larva is completed in 24 days. The primary cavity is formed in 9 days, the separation of the cercomere anlage--in 11 to 12 days and the invagination of the larva--in 19 days. The larval development of P. porosa is characterized by its passing in the cavity of the external cyst, by the complete separation of anlages of the body of the larva and cercomere at the metamere stage and by the intensive growth of the cercomere after the invagination of the larva. The analysis of the cercomere structure suggests its protective function.