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Redescription and new data on Microsomacanthus diorchis (Fuhrmann, 1913) (Cestoda: Hymenolepididae)

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Microsomacanthus diorchis (Fuhrmann, 1913) is redescribed and illustrated on the basis of the type-material and new findings from common eider Somateria mollissima captured in Iceland and specimens from the same host species from the Barents, White and Bering Seas. A lectotype is designated and an amended diagnosis is provided. The main differentiating features of M. diorchis are the size and shape of rostellar hooks and the cirrus, the well-marked delay in the antiporal testis development and the bow-shaped uterus. This parasite is shown to be specific to S. mollissima for both Atlantic and Pacific populations of the host. Hymenolepis (Microsomacanthus) somateriae of Bishop & Threlfall (1974) [nec M. somateriae Ryzhikov, 1965] is recognised as a synonym of M. diorchis (Fuhrmann, 1913). The taxonomic position of the species described as Aploparaksis murmanica Baylis, 1919 from common eider is discussed.

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  1. 1.

    This is the correct spelling, not ‘Eyafjord’ as Fuhrmann (1913) noted.


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The authors gratefully acknowledge Dr K.V. Galaktionov of the Zoological Institute, Russian Academy of Sciences, St Petersburg, and Dr V.V. Kuklin of the Murmansk Marine Biological Institute, who provided the material collected from eider ducks on Franz Josef Land and the Murman Coast for this study. This study was supported by the Muséum d’Histoire Naturelle de Genève.

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Correspondence to Jean Mariaux.

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Galkin, A.K., Mariaux, J., Regel, K.V. et al. Redescription and new data on Microsomacanthus diorchis (Fuhrmann, 1913) (Cestoda: Hymenolepididae). Syst Parasitol 70, 119–130 (2008). https://doi.org/10.1007/s11230-008-9134-x

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  • Seminal Receptacle
  • Common Eider
  • Hook Length
  • Female Gland
  • Osmoregulatory Canal