Encapsulation of the Acanthocephalan Sphaerirostris picae in Its Natural Paratenic Host, Lacerta agilis.

This study presents the structure of the capsule around the acanthocephalan Sphaerirostris picae (Rudolphi, 1819) Golvan, 1956, in its natural paratenic host, Lacerta agilis Linnaeus, 1758. The capsule was composed of 2 layers: a thin, dense inner layer and a loose, thick outer layer. The inner layer was formed by macrophages and multinucleated cells.

Structure of capsule around acanthocephalan Corynosoma strumosum from uncommon paratenic hosts-lizards of two species.

Micromorphology and ultrastructure of capsule forming around acanthocephalan Corynosoma strumosum in uncommon paratenic hosts-lizards Lacerta agilis and Lacerta viridis-have been studied. Experimental infestation of the lizards by acanthocephalans obtained from naturally infested sea fishes showed that only small amount of parasites occurred in the intestine of the host was able to migrate into body cavity and to be encapsulated. Micromorphology of capsules of different ages from different species of lizards and micromorphology and ultrastructure of capsules at the age of 1.

Structure of capsule surrounding acanthocephalans Corynosoma strumosum in paratenic hosts of three species.

Morphology of capsules surrounding acanthocephalan Corynosoma strumosum in paratenic hosts (sea fishes of three species from the northern part of the Sea of Okhotsk) was studied. A thick layer of glycocalyx is formed on the surface of acanthocephalan's tegument in smelts Osmerus mordax dentex and Hypomesus olidus; the surrounding capsule is formed by fibroblasts and collagen fibers and do not include inflammatory cells. Besides fibroblasts, capsule of the sole Limanda aspera consists also of macrophages, granulocytes, "dark" cells, and once of erythrocytes that indicate obvious inflammatory response of the host's organism to invasion; glycocalyx on the surface of acanthocephalans from the sole is weakly developed.