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.