Zeitschrift für Parasitenkunde

, Volume 59, Issue 1, pp 67–78 | Cite as

On the morphology and life-history ofDerogenes varicus (Müller, 1784) Looss, 1901 (Trematoda, Hemiuridae)

  • Marianne Køie


The cystophorous cercaria ofDerogenes varicus (Müller, 1784) Looss, 1901 (=Cercaria appendiculata Pelseneer, 1906) develops in rediae inNatica spp. The cercaria is able to swim by undulating its furcate appendage. The free-swimming cercaria is eaten by calanoid or harpactacoid copepods. Mechanical pressure of the mouth limbs of the copepod causes the evagination of the long delivery tube, which in free-swimming cercariae is coiled up in the caudal vesicle. The cercarial body is pressed through the delivery tube and injected into the body cavity of the copepod.

ImmatureD. varicus were found in the stomachs of 0-group plaice and dab fed uponCalanus finmarchicus (Gunnerus) containing two-week old metacercariae. Gobies became infected by eating infected harpactacoid copepods. If gobies with immatureD. varicus were given to a cod they matured in this fish, and matureD. varicus were positively transferred from one cod to another.

The cercaria is redescribed, and the different developmental stages are described using the scanning electron microscope.

Previous records ofD. varicus from invertebrate hosts are given.


Electron Microscope Scanning Electron Microscope Developmental Stage Body Cavity Mechanical Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Marianne Køie
    • 1
  1. 1.Marine Biological LaboratoryHelsingørDenmark

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