Nikishin V.B. 2008. [Structure and differentiation of tissues of cysticercoids. 1. Fine morphology of the diplocyst of Aploparaksis bulbocirrus (Cestoda: Hymenolepididae) at the early stages of postembryogenesis] // Invertebrate Zoology. Vol.4 (for 2007). No.2: 129–138 [in Russian, with English summary].

Institute of the Biological Problems of the North, Portovaya Str. 18, 685000 Magadan Russia. E-mail:

KEY WORDS: cysticercoid, diplocyst, ultrastructure, early stages of development.

ABSTRACT: The ultrastructure of the typical diplocyst of Aploparaksis bulbocirrus Deblock et Rausch, 1968 is studied and the main peculiarities of the cellular organization at the early stages of its development are determined. At the stage of the primary lacuna the cellular composition is represented by the cytons of tegument, by muscular cells, and by two types of undifferentiated ones; at the stage of elongation the cells, bounding primary lacuna, begin differentiate. All the cells, except cytons of tegument, are differentiated out from the undifferentiated elements; the population of the cytons of tegument is possibly formed from the binuclear cyton of the oncosphere.

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