Encyclopedia of Parasitology

Living Edition
| Editors: Heinz Mehlhorn


  • Heinz Mehlhorn
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27769-6_4636-1

Curiously shaped family of digenetic trematodes the members of which live in pairs in cysts on the surface, gills, operculum, or on the walls of the oral cavity or pharynx of marine fishes, seldom in the interior. Characteristics of the family are the demarcation of a slender or spoon-like forebody from the cylindroid, plump or rounded hindbody, and the slender, long, tubular shape of the ovary, testis, and yolk gland. Species of Nematobothrium are up to 1 m long. Didymozoon species possess a plump and cylindroid hindbody, while Didymocystis sp. has a short protruding forebody. All these genera are hermaphroditic. In contrast to this, Wedlia sp. is characterized by its body shape. The small male hindbody is lodged in a depression of the large rounded female hindbody, from which the tiny female forebody protrudes. Thus, these specimens are dioecious.


Oral Cavity Marine Fish Body Shape Digenetic Trematode Tubular Shape 
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Further Reading

  1. Hyman LH (1951) The invertebrates, vol. II. Platyhelminthes. McGraw Hill, New YorkGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Institut für Zoomorphologie, Zellbiologie und ParasitologieHeinrich-Heine-UniversitätDüsseldorfGermany