Folia Parasitologica 52[3] 251-260 (2005) | DOI: 10.14411/fp.2005.033

Redescription of Eubothrium fragile (Rudolphi, 1802) and E. rugosum (Batsch, 1786) (Cestoda: Pseudophyllidea), parasites of fish in the Holarctic Region

Roman Kuchta1, Vladimíra Hanzelová2, Andy P. Shinn3, Larisa G. Poddubnaya4, Tomáš Scholz1
1 Institute of Parasitology, Academy of Sciences of the Czech Republic and Faculty of Biological Sciences, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czech Republic
2 Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 10 Košice, Slovakia
3 Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, Scotland, UK
4 Institute of Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Yaroslavl Province, Russia

Two fish cestodes, the little-known Eubothrium fragile (Rudolphi, 1802) and E. rugosum (Batsch, 1786), the type species of the genus Eubothrium Nybelin, 1922, are redescribed on the basis of new material from twaite shad, Alosa fallax (Lacépède, 1803), from England and burbot, Lota lota (Linnaeus, 1758), from Russia, respectively. The tapeworms are compared with two other species of the genus, E. crassum (Bloch, 1779) and E. salvelini (Schrank, 1790), common parasites of salmonid fish in the Holarctic. The most notable differential characters are the size and the shape of the scolex (smaller and oval in E. fragile), the shape of the apical disc (four or more indentations in E. crassum), the number and size of the testes (the largest and least numerous in E. rugosum), and the position and size of the vitelline follicles (almost entirely cortical in distribution in E. fragile and E. crassum versus largely medullary in E. rugosum and E. salvelini). A comparison of species has also shown the morphological similarity of the freshwater species (E. rugosum and E. salvelini) on one hand and those of marine origin, E. fragile and E. crassum, on the other, with the latter species occurring also in fresh waters. A key to the identification of the species studied is also provided.

Keywords: Eubothrium fragile, Eubothrium rugosum, redescription, fish cestodes, Lota lota, Alosa fallax, morphology

Received: July 16, 2004; Accepted: January 12, 2005; Published: June 1, 2005  Show citation

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Kuchta, R., Hanzelová, V., Shinn, A.P., Poddubnaya, L.G., & Scholz, T. (2005). Redescription of Eubothrium fragile (Rudolphi, 1802) and E. rugosum (Batsch, 1786) (Cestoda: Pseudophyllidea), parasites of fish in the Holarctic Region. Folia Parasitologica, 52(3), 251-260. doi: 10.14411/fp.2005.033
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