Systematic Parasitology

, Volume 91, Issue 3, pp 261–271 | Cite as

Description of Diorchis thracica n. sp. (Cestoda, Hymenolepididae) from the ruddy shelduck Tadorna ferruginea (Pallas) (Anseriformes, Anatidae) in Bulgaria

  • Margarita H. Marinova
  • Boyko B. Georgiev
  • Gergana P. Vasileva


Diorchis thracica n. sp. (Cestoda, Cyclophyllidea, Hymenolepididae) is described from the ruddy shelduck Tadorna ferruginea (Pallas) (Aves, Anseriformes, Anatidae), collected in the vicinities of Radnevo, Stara Zagora Region, Bulgaria. The new species is differentiated from other members of Diorchis Clerc, 1903 by possessing rostellar hooks with length of 36 µm, a thick-walled cirrus-sac with strong longitudinal muscular fibres in its middle part and a copulatory vagina with two sphincters. Main morphological criteria for distinguishing species of the genus Diorchis are discussed.


Osmoregulatory Canal Rostellar Hook External Seminal Vesicle Vaginal Sphincter Longitudinal Muscle Bundle 
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.



Dr J. Mariaux (Natural History Museum, Geneva, Switzerland) kindly provided the type-series of Diorchis acuminata for re-examination.


The work was supported by the project 4E/2012 of the Thracian University funded by the National Science Fund and partly by the project WETLANET (EC FP7, Programme CAPACITIES, Grant 229802) and the National Science Foundation (USA), PBI grants DEB 0818696 and DEB 0818823 (to J. N. Caira and K. Jensen). This study used facilities developed at the Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences and the Thracian University of Stara Zagora in the frames of the projects CEBDER (National Science Fund of the Republic of Bulgaria, Grant DOO2-15/17.02.2009).

Conflict of interest

The authors declare that they have no conflict of interest.

Compliance with ethical standards

All applicable institutional, national and international guidelines for the care and use of animals were followed.


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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Margarita H. Marinova
    • 1
  • Boyko B. Georgiev
    • 2
  • Gergana P. Vasileva
    • 2
  1. 1.Faculty of AgricultureThracian UniversityStara ZagoraBulgaria
  2. 2.Institute of Biodiversity and Ecosystem ResearchBulgarian Academy of SciencesSofiaBulgaria

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