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

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Abstract

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.

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Acknowledgements

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

Funding

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).

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The authors declare that they have no conflict of interest.

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

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Correspondence to Gergana P. Vasileva.

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Marinova, M.H., Georgiev, B.B. & Vasileva, G.P. Description of Diorchis thracica n. sp. (Cestoda, Hymenolepididae) from the ruddy shelduck Tadorna ferruginea (Pallas) (Anseriformes, Anatidae) in Bulgaria. Syst Parasitol 91, 261–271 (2015). https://doi.org/10.1007/s11230-015-9569-9

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