Morphological features of the nasal blood fluke Trichobilharzia regenti (Schistosomatidae, Digenea) from naturally infected hosts
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The first author detected the nasal bird schistosome Trichobilharzia regenti in Iceland in Anas platyrhynchos in Landmannalaugar in autumn of 2003. Since then, measurements and morphological studies have been performed on fresh worms (fragments) obtained in the area from naturally infected ducks, A. platyrhynchos and Aythya marila. In the present study, we compare our findings to the original description of T. regenti by Horák et al. (Parasite 5:349–357, 1998) that relies upon worms obtained by experimental infections of A. platyrhynchos f. domestica and Cairina moschata f. domestica ducklings. Fragments obtained from naturally infected birds are markedly larger than those obtained in the experimental infection. Also, indistinct sex-related size difference was confirmed; males were more abundant in the material than females. Previously unknown morphological features detected in the present study include, e.g. subterminal spines on the oral sucker directed to the oral opening, spine pattern on the apical part of acetabulum and long tegumental spines (up to 16 μm) in the gonad and tail regions of both sexes. In males, we evaluated for the first time the morphology of the cirrus sac enclosing ejaculatory duct, prostata and the entire prostatic region, the course of vas deferens and the position of genital papilla. In females, the posterior part of the reproductive system was studied for the first time. The presence of the Laurer’s canal was confirmed and its course from the oviduct to the surface, where spermatozoa were noticed to leave the canal, was described.
KeywordsOral Sucker Infected Bird Mute Swan Bird Schistosome Tegumental Spine
In Iceland, the authors would like to thank Broddi Hilmarsson, Freyr Björnsson, Guðmundur Tryggvi Ólafsson and Þorvaldur Björnsson for bird sampling. Kirill V. Galaktionov is thanked for valuable comments on digenean morphology and evolution. Financial support was provided by the Research Fund of the University of Iceland and the Jules Verne Program for French–Icelandic scientific cooperation. The work of PH was supported by the Ministry of Education of the Czech Republic (grant nos. MSM 0021620828 and MSM LC06009) and the Czech Science Foundation (grant no. 206/09/H026).
- Fain A (1955a) Une nouvelle bilharziose des oiseaux: la trichobilharziose nasale. Remarque sur l’importance des Schistosomes d’oiseaux en pathologie humaine. Note préliminaire. Ann Soc Belg Med Trop 35:323–327Google Scholar
- Fain A (1955b) Recherche sur les Schistosomes d’oiseaux au Ruanda-Urundi (Congo belge). Découverte d’une nouvelle bilharzie aviaire: la Trichobilharzie nasale, et description de Schistosomes nouveaux. Note préliminaire. Rev Zool Bot Afr 51:373–387Google Scholar
- Fain A (1956a) Les Schistosomes d’oiseaux du genre Trichobilharzia Skrjabin et Zakharow, 1920 au Ruanda-Urundi. Rev Zool Bot Afr 54:147–178Google Scholar
- Fain A (1959) Un nouveau schistosome du genre Trichobilharzia dans les fosses nasales du Canard nain. Rev Zool Bot Afr 60:227–232Google Scholar
- Galaktionov KV, Dobrovolskij AA (2003) The biology and evolution of trematodes. Kluwer Academic Publishers, DordrechtGoogle Scholar
- McMullen DB, Beaver PC (1945) Studies on schistosome dermatitis. IX. The life cycles of three dermatitis-producing schistosomes from birds and a discussion of the subfamily Bilharziellinae (Trematoda: Schistosomatidae). Am J Hyg 42:128–154Google Scholar
- Neuhaus W (1952) Der Einfluss des Zwischenwirtes auf die Gestalt der Cercariae von Trichobilharzia szidati Neuhaus, 1951 und ihre systematische Kennzeichnung. Zool Anz 148:275–285Google Scholar
- Skírnisson K (2010) Bird schistosomes and swimmer’s itch in Iceland. Náttúrufræðingurinn 79:71–81 (In Icelandic with English summary)Google Scholar
- Skírnisson K, Kolářová L (2005) Swimmer’s itch in Landmannalaugar, Iceland. Icel Med J 91:729–736 (In Icelandic with English summary)Google Scholar
- Skrjabin KI (1947) Trematodes of animals and man. Akademii Nauk SSSR, MoscowGoogle Scholar