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A heavy infection of Monobothrium wageneri. (a) A heavy infection of Monobothrium wageneri comprising over 100 tapeworms in a single cluster, scale bar = 1 cm. (b) Attachment of M. wageneri resulted in the formation of a raised, rounded nodule (arrow) surrounding the worms, scale bar = 5 mm. (c) Anterior intestine of a tench, Tinca tinca, infected with M. wageneri; note the deep penetration (arrows) of the scolex and neck of worm, scale bar = 1.3 mm.
