Figure 1

Developmental stages of the metacercariae of Ichthyocotylurus pileatus and I. variegatus in perch. A-D I. pileatus; A - recently established metacercaria, B-C - encapsulating metacercaria, D - fully developed and encapsulated metacercaria. E-G I. variegatus; E - recently established metacercaria, F - encapsulating metacercaria, G - fully developed and encapsulated metacercaria. Morphology of the metacercariae and cysts are based on averages from 40 individuals (B-C, D, G) or on measurements from few individuals taken under a light microscope (A, E, F). The scale bar is 300 μm.