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SEM of mature specimens of Echinorhynchus baeri from S. trutta in Turkey. 11. Proboscis of a female specimen. Note variation in hook size; smaller hooks at base 12. Anterior hooks. Note indentation at the base of the hooks (arrow). 13. Double miniature hooks at apical end of proboscis (arrow); occasionally one miniature apical hook present. 14. Higher magnification of an apical hook; note perforations. This hook has a low Ca reading (see EDAX data). 15. A gallium cut normal hook from the mid-proboscis. Note prominent calcified root. 16. A gallium cut miniature apical hook. Note the hollow base and absence of roots.
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