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. 2011 Jul 15;138(9):1164–1175. doi: 10.1017/S0031182011000916

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Copyright © Cambridge University Press 2011. The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.

The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.

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Fig. 4 — Scanning electron microscopy (SEM) of Ichthyobodo spp. trophozoites on gills of Atlantic salmon (Salmo salar). (A–G) Ichthyobodo salmonis sp. n. from brackishwater reared smolt. (A) Trophozoites attached to secondary gill lamellae; (B) trophozoites attached on the surface of a primary gill filament; (C) Single trophozoite, dorsal view; (D) trophozoite, ventral view; (E) quadri-flagellated (2 long, 2 short flagella) trophozoite, ventral view; (F) 2 trophozoites; (G) quadri-flagellated, ventral view (1short flagellum just visible in furrow); (H–K) Ichthyobodo necator s.s. from hatchery reared parr; (H) ventral view; (I) ventral view, flagella clearly visible; (J) same trophozoite shown in (I) close-up of the penetration area (scale bar=1 μm); (K) dorsal view; (D, E and G) arrows mark spine-like surface projections characteristic for I. salmonis sp.n. All scale bars except (J)=5 μm.