U predstavitelya tsiklofillidnykh tsestod Sobolevicanthus gracilis formirovanie bursy tsirrusa proiskhodit iz dvukhsloinogo polovogo zachatka. Vnutrennii sloi zachatka obrazuet epitelial'nye stenki polovykh protokov putem raskhozhdeniya malodifferentsirovannykh kletok. Yadra epitelial'nykh kletok v protsesse morfogeneza pogruzhayutsya v glub' bursy tsirrusa. Vneshnii sloi zachatka sostoit iz rano differentsiruyushchikhsya myshechnykh kletok, kotorye formiruyut v burse tolstye soedinitel'notkannye plastinki i sloi myshechnykh volokon. Stilet i okruzhayushchii ego futlyar yavlyayutsya derivatami myshechnykh kletok. Ustanovleno, chto u S. gracilis poetapno obrazuetsya slozhnaya triedinaya epitelial'no-myshechno-zhelezistaya struktura, funktsioniruyushchaya kak futlyar stileta i predstatel'naya zheleza odnovremenno. Obsuzhdaetsya rol' gladko-myshechnykh kletok v differentsirovke raznoobraznykh gistologicheskikh struktur, osoboe vnimanie udelyaetsya sposobam formirovaniya tverdykh kopulyativnykh obrazovanii u ploskikh chervei.

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