Encyclopedia of Parasitology

2016 Edition
| Editors: Heinz Mehlhorn


Reference work entry
DOI: https://doi.org/10.1007/978-3-662-43978-4_2959
Most common meanings are:
  • Cyst inside oocysts of  Coccidia containing the infectious stages = sporozoites ( Gregarines).

  • Developmental stage of digenean life cycle ( Digenea/Life Cycle) inside the first intermediate host snail. These sporocysts produce depending on the species – daughter sporocysts,  rediae, or  cercariae. The latter leave the snail and may become infectious to a second intermediate host (e.g., in the case of Clonorchis), to the final host (e.g.,  Schistosoma), or are attached at plants to become metacercariae (e.g.,  Fasciola hepatica,  Fasciolopsis buski).

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